The daily maximum of just sodium (Na) should be = 6000 mg
Calculation of adult daily salt consumptionThe adult's daily maximum intake of salt = 6g
The major element of salt that causes health concerns is sodium (Na).
Therefore the quantity of sodium consumed in milligrammes= 6×1000
= 6000 mg
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Using a chemical equation to find moles of product from moles of reactant
Answer:
0.86 moles H₂O
Explanation:
To solve this problem, it is important to first determine the balanced chemical equation. The balanced equation is necessary as it will provide the mole-to-mole ratio needed to convert between moles O₂ and moles H₂O.
The unbalanced equation:
C₈H₁₈ (l) + O₂ (g) ---> CO₂ (g) + H₂O (g)
Reactants: 8 carbon, 18 hydrogen, 2 oxygen
Products: 1 carbon, 2 hydrogen, 3 oxygen
As you can see, the equation is not balanced because there are unequal amounts of each element on both sides. Balancing the equation is a matter of guessing-and-checking to see which combination of coefficients work.
The balanced equation:
2 C₈H₁₈ (l) + 25 O₂ (g) ---> 16 CO₂ (g) + 18 H₂O (g)
Reactants: 16 carbon, 36 hydrogen, 50 oxygen
Products: 16 carbon, 36 hydrogen, 50 oxygen
Now that the equation is balanced, we can use the coefficients of O₂ and H₂O to construct our mole-to-mole ratio and perform our conversion. The final answer should have 2 sig figs to match the given value (1.2 moles). The state of matter is most likely not necessary to include in your final answer.
1.2 moles O₂ 18 moles H₂O
--------------------- x ----------------------- = 0.86 moles H₂O
25 moles O₂
Calculate the energy for the transition of an electron from the n = 2 level to the n = 5 level of a hydrogen atom.
The energy for the transition:
The energy for the transfer of an electron from the n=2 level to the n=5 level of a hydrogen atom is 4.57 x [tex]10^{-19}[/tex] J
Calculation:
We are aware of the energy levels as n=2 and n=5. So, we may determine the wavelength of the photon released by the electron during this transition using Rydberg's equation:
1/λ = R x (1/[tex]n^{2}[/tex][tex]_{final}[/tex] - 1/[tex]n^{2} _{initial}[/tex])
where,
1/λ = the wavelength of the emitted photon,
R = Rydberg's constant, 1.0974 x [tex]10^{7} m^{-1}[/tex]
[tex]n_{final}[/tex] = the final energy level = 5
[tex]n_{initial}[/tex] = the initial energy level = 2
Now, put the value in the above equation, we get,
1/λ = 1.0974 x [tex]10^{7} m^{-1}[/tex] x ( 1/[tex]5^{2}[/tex] - 1/[tex]2^{2}[/tex] )
1/λ = 1.0974 x [tex]10^{7}[/tex][tex]m^{-1}[/tex] x (-0.21)
1/λ = -0.23 x [tex]10^{7}[/tex][tex]m^{-1}[/tex]
λ = 4.347 x [tex]10^{-7}[/tex]m
Since, E = hc/λ
where,
h = Plank's constant = 6.626 x [tex]10^{-34}[/tex] Js
c = speed of light = 3 x [tex]10^{8}[/tex] m/s
So, the transition energy for your particular transition is,
E = 6.626 x [tex]10^{-34}[/tex] x 3 x [tex]10^{8}[/tex] / (4.347 x [tex]10^{-7}[/tex])
E = 4.57 x [tex]10^{-19}[/tex] J
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Hypothesis:
Before you begin, predict how many compounds you can make from the elements below. Pick one element from the metal list and two from the nonmetal list.
For example, "If I use sodium, hydrogen, and oxygen, then I can make ten new compounds in five minutes."
Now, you try! Make a prediction. Be sure to record your prediction on your lab report.
Metal Nonmetal
• Sodium (Na)
• Calcium (Ca)
• Hydrogen (H)
• Oxygen (O)
• Carbon (C)
• Chlorine (Cl)
I can form two compounds if I combine calcium, hydrogen and oxygen in five minutes.
What is a compound?A compound is formed by the combination of atoms. It is important to note that the same atoms can be combined in different ways to produce new compounds.
I can form two compounds if I combine calcium, hydrogen and oxygen in five minutes.
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Which of the following are examples of elements?
a. CO
b. Li
c. KBr
d. Ca
[tex]\huge\boxed{\textsf{Li and Ca}}[/tex]
An element is a substance that can't be broken down further. Lithium (Li) and calcium (Ca) are examples of elements.
Carbon monoxide (CO) and potassium bromide (KBr) are examples of compounds, which are made up of more than one element put together.
1. What is the pH of a solution with a [H3O+] concentration of 4.32 x 10-2 M?
Is the solution acidic, basic or neutral?
Considering the definition of pH, the pH is 1.36 and since it is lower than 7, the solution is acidic.
Definition of pHpH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:
pH= - log [H⁺]= - log [H₃O⁺]
Numerical scale of pHThe numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.
pH in this caseIn this case, a solution has a [H₃O⁺] concentration of 4.32×10⁻² M. You can replace this value in the definition of pH:
pH= -log (4.32×10⁻² M)
Solving:
pH= 1.36
Finally, the pH is 1.36 and since it is lower than 7, the solution is acidic.
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Traveling at the speed of light - how long would it take, in years, to reach the top of the pile of balls given that the height of the pile is 1.10 *10^14 km. show all calculations. c= 3.00 x 108 m/s , speed of light
It will take 0.012 year to reach the top of the pile of balls.
Given:
height of the pile = 1.10 x 10¹⁴km = 1.10 x 10¹⁷m
speed of light = 3.00 x 10⁸ m/s
Time = distance / speed
= 1.10 x 10¹⁴m / 3.00 x 10⁸ m/s
= 3.67 x 10⁸ s
= 0.012 year
Therefore, the time taken for the object to reach to top of pile is 0.012 year.
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What is the average of atomic mass of carbon if 98.90% of the atoms are c-12 and 1.100% are c-13 atoms?
Answer:
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4. How many grams of hydrogen is produced from 12.5 g of Mg reacting with hydrochloric acid in this
balanced equation?
Mg + 2HCl → MgCl₂ + H₂
5. How many grams of aluminum phosphate is produced from 7.5 g of lithium phosphate in this balanced
equation?
2Li3PO4 + Al2(SO4)3 → 3Li2SO4 + 2AIPO4
From the reactions, 1.04 g of H2 and 7.995 g of aluminum phosphate is produced.
What is stoichiometry?The term stoichiometry has to do with the amount of substances that participates in a reaction.
For reaction 1;
Mg + 2HCl → MgCl₂ + H₂
Number of moles of Mg reacted = 12.5 g/24g/mol = 0.52 moles
If 1 mole of Mg produced 1 mole of H2
0.52 moles produces 0.52 moles of H2
Mass of H2 = 0.52 moles * 2 g/mol = 1.04 g
For reaction 2;
2Li3PO4 + Al2(SO4)3 → 3Li2SO4 + 2AIPO4
Number of moles of lithium phosphate = 7.5 g/116 g/mol = 0.065 moles
2 moles of Li3PO4 produced 2 moles of AIPO4
0.065 moles of Li3PO4 produced 0.065 moles of AIPO4
Mass of AIPO4 = 0.065 moles * 123 g/mol = 7.995 g
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What is the half-life of a compound if 42% of a given sample of the compound decomposes in 60 minutes
The half-life of a compound is 76 years for 42% of a given sample of the compound decomposes in 60 minutes.
What is the expression for rate law for first order kinetics?The rate law for first order kinetics is
k = [tex]\frac{2.303}{t}log\frac{a}{a-x}[/tex]
Where
k - rate constant
t - time passed by the sample
a - initial amount of the reactant
a-x - amount left after the decay process
What is expression for half-life of the compound?The expression for the half-life of the compound is
[tex]t_{\frac{1}{2} }=\frac{0.693}{k}[/tex]
Where k is the rate constant
Calculation for the given compound:It is given that
t = 60 minutes
a = 100 g
a-x = 100 g - 42 g = 58 g
(Since it is given that 42% of the given compound decomposes)
Then,
k = [tex]\frac{2.303}{60}log\frac{100}{58}[/tex]
= 9.08 × [tex]10^{-3}[/tex] [tex]years^{-1}[/tex]
Then, the half-life of the compound is
[tex]t_{\frac{1}{2} }=\frac{0.693}{k}[/tex]
= [tex]\frac{0.693}{9.08*10^{-3} }[/tex]
= 76.3 years ≅ 76 years
Therefore, the half-life of the given compound is 76 years.
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What mass of PCl5 will be produced from the given masses of both reactants? Express your answer to three significant figures and include the appropriate units.
69 gram PCl₅ will be produced from the given masses of both reactants that is 28.0 g of P₄ and 59.0 g of Cl₂.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
Now we have to write the balanced equation
P₄ + 10Cl₂ → 4PCl₅
How to calculate the number of moles ?To calculate the number of moles used the formula
Number of moles = [tex]\frac{\text{Given Mass}}{\text{Molar mass}}[/tex]
Number of moles of P₄ = [tex]\frac{\text{Mass of}\ P_4}{\text{Molar mass of}\ P_4}[/tex]
= [tex]\frac{28\ g}{124\ g/mol}[/tex]
= 0.225 mol
Number of moles of Cl₂ = [tex]\frac{\text{Mass of}\ Cl_2}{\text{Molar mass of}\ Cl_2}[/tex]
= [tex]\frac{51\ g}{71\ g/mol}[/tex]
= 0.831 mol
From the balanced chemical equation we can say that the ratio of P₄ and Cl₂ is 1 : 10.
Ratio of P₄: 0.2260: 1 = 0.2260
Ratio of Cl₂: 0.8310: 10 = 0.08310
Because ratio of Cl₂ ratio smaller than P₄ becomes the limiting reactants
So mole of PCl₅ is based on mole of Cl₂
From the coefficient of reaction:
mol PCl₅: mol Cl₂ = 4: 10
Mole of PCl₅ = [tex]\frac{4}{10} \times 0.8310[/tex]
= 0.3324
Molar mass of PCl₅= 208.5
Mass of PCl₅ = mole × molar mass
Mass of PCl₅ = 0.3324 × 208.5
Mass of PCl₅ = 69 gram
Thus from the above conclusion we can say that 69 gram PCl₅ will be produced from the given masses of both reactants that is 28.0 g of P₄ and 59.0 g of Cl₂.
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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: What mass of PCl₅ will be produced from the given masses of both reactants that is 28.0 g of P₄ and 59.0 g of Cl₂ ?
69.3 gram PCl₅ will be produced from the given masses of both the reactants.
Balanced chemical equation is
P₄ + 10Cl₂ → 4PCl₅
Four moles of PCl₅ are produced by combining one mole of P₄ with ten moles of chlorine.
Given mass of P₄ = 28gm
Molecular mass of P₄ = 123.89 g/mole
No. of moles(P₄) = Given mass / Molar mass
=28/123.89 =0.226 moles …. (1)
Given mass of Cl₂ = 59gm
Molecular mass of Cl₂ = 70.906 g/mole
No. of moles of Cl₂ = 59/70.906 = 0.832 mole.... (2)
From the chemical equation
Ratio of moles of P₄ and Cl₂ is 1 : 10
Also, from equation (1) & (2)
Ratio of moles of P₄ and Cl₂ is 0.226 : 0.832
If we make the ratio 1 : 1 then,
Ratio of moles of P₄ and Cl₂ becomes 0.226 : 0.0832
As the ratio of moles of Cl₂ is less than moles of P₄ , So Cl₂ becomes the limiting reactant.
Hence, mole of PCl₅ can be estimated on the basis of moles of Cl₂
From the coefficient of reaction:
mole of PCl₅ : mole of Cl₂ = 4: 10
10 moles of Cl₂ produce 4 moles of PCl₅
O.832 moles of Cl₂ produce 0.3328 moles of PCl₅
Molecular mass of PCl₅= 208.5 g/mole
Mass of PCl₅ = No. of moles × molar mass
Mass of PCl₅ = 0.3328 × 208.5
Mass of PCl₅ = 69.3 gram
Thus from the above conclusion we can say that 69.3 gram PCl₅ will be produced from the given masses of both reactants that is 28.0 g of P₄ and 59.0 g of Cl₂.
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the texture of ash left behind when cotton and rayon fibre burned
What is the frequency of electromagnetic radiation needed to excite an electron in a hydrogen atom from the n = 3 orbit to the n = 6 orbit? How much energy does 800. millimoles of these photons have?
The energy of 800 milimoles of photons is 1.38 * 10^-19 J.
What is excitation of electrons?We know that an electron can move from a lower to higher energy level according to the formula;
1/λ = RH(1/ni^2 - 1/nf^2)
RH = 1.097 * 10^7m-1
ni = 3
nf = 6
Thus;
1/λ = 1.097 * 10^7(1/3^2 - 1/6^2)
1/λ = 1.097 * 10^7(1/9 - 1/36)
1/λ = 1.097 * 10^7(0.11 - 0.03)
λ =1.14 * 10^-6 m
v = λf
f = v/λ
f = 3 * 10^8 m/s/1.14 * 10^-6 m
f = 2.6 * 10^14 Hz
Now
E = hf
E= 6.63 * 10^-34 * 2.6 * 10^14 Hz
E = 1.72 * 10^-19 J
Now;
1 mole of photons has 1.72 * 10^-19 J of energy
800 * 10^-3 moles of photons has 800 * 10^-3 moles * 1.72 * 10^-19 J/ 1 mole
= 1.38 * 10^-19 J
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When an electron in an atom absorbed a photon, the energy of the electron changed by 2.94 x 10-19 J. What is the frequency of the photon in Hertz (1/s)
When an electron in an atom absorbed a photon, the energy of the electron changed by 2.94 × 10⁻¹⁹. The frequency of the photon is 4.4 × 10¹⁴ Hertz .
How to calculate the frequency of photon ?To calculate the frequency of photon use the expression
E = hv
where,
E = Energy
h = Planck's Constant
v = frequency (Hz)
Put the value in above formula we get
E = hv
2.94 × 10⁻¹⁹ = 6.6 × 10⁻³⁴ × v
v = [tex]\frac{2.94 \times 10^{-19}\ J}{6.6 \times 10^{-34}}[/tex]
= 0.44 × 10¹⁵
= 4.4 × 10¹⁴
Thus from the above conclusion we can say that When an electron in an atom absorbed a photon, the energy of the electron changed by 2.94 × 10⁻¹⁹. The frequency of the photon is 4.4 × 10¹⁴ Hertz .
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The pressure of a monatomic gas is 233 kPa. The gas is compressed from an initial volume of 0.76 m3 to a final volume of 0.48 m3 while maintaining constant pressure. How much heat flows into or out of the gas
163.1 KJ of heat flows into the gas.
As the pressure is constant, then it is a isobaric process.
In this process , Heat flows is [tex]Q=nC_{p}[/tex]ΔT
Work done is represented by W = PΔV= nRΔT
γ for monoatomic gas is [tex]\frac{5}{3}[/tex]
So, their ratio is
[tex]\frac{W}{Q}[/tex] = [tex]\frac{R}{C_{P} }[/tex] = R/γR/γ-1 = [tex]\frac{2}{5}[/tex] ….. (1)
Hence, Ratio of W and Q is 2/5
Now given,
Pressure = 233 kPa = 233000 Pa
ΔV= 0.76-0.48 = 0.28[tex]m^{3}[/tex]
So, W = PΔV = 233000 × 0.28 = 65240J
From equation (1)
[tex]\frac{65240}{Q} =\frac{2}{5}[/tex]
Q = 163100J or 163.1 KJ
As the value of Q is positive so, 163.1 KJ of heat flows into the gas.
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H2so4+na oh= naso4+h20, if 30.0g of h2so4 reacts with sodium hydroxide what mass of water is produced
The mass of water produced is 5.58g.
The given reaction is a neutralization reaction. Since both acid and base are strong, so, they dissociate completely to form salt and water. Therefore the number of moles of acid, base, salt, and water are equivalent.
Step-1: Calculate the number of moles of [tex]H_{2}SO_{4}[/tex].
Given the mass of [tex]H_2SO_4[/tex] is 30g.
Molar mass of [tex]H_2SO_4[/tex] is 98g/mole.
Using the formula,
Number of moles= Mass/Molarmass
=30/98
=0.31 mole
Step-2: Mass of water
The molar mass of [tex]H_2O[/tex] is 18g.
The number of moles of [tex]H_2O[/tex] formed is 0.31 mole.
Using the formula,
Mass = Number of moles x Molar mass
Mass of [tex]H_2O[/tex] = 0.31 mole x 18g/ mole
=5.58g
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What is the half-life of a radioisotope if it decays to 25% of its original activity in 7 yr?
Answer:
3.5 yrs
Explanation:
If a sample has decayed to 25%, this means 2 half-lives have passed. We are given this is equal to 7 yrs, and it follows that one half life is 3.5 yrs.
If you have 6.0-g of lithium and you add it to excess manganese (IV) oxide, how many grams of the product Li2O do you form theoretically.
4Li + MnO2 ----> 2Li2O + Mn
Taking into account the reaction stoichiometry, 12.857 grams of Li₂O are formed when 6 grams of Li reacts.
Reaction stoichiometryIn first place, the balanced reaction is:
4 Li + MnO₂ → 2 Li₂O + Mn
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Li: 4 molesMnO₂: 1 mole Li₂O: 2 moles Mn: 1 moleThe molar mass of the compounds is:
Li: 7 g/moleMnO₂: 87 g/moleLi₂O: 30 g/moleMn: 55 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Li: 4 moles ×7 g/mole= 28 gramsMnO₂: 1 mole ×87 g/mole= 87 gramsLi₂O: 2 moles ×30 g/mole= 60 gramsMn: 1 mole ×55 g/mole= 55 gramsMass of Li₂O formedThe following rule of three can be applied: if by reaction stoichiometry 28 grams of Li form 60 grams of Li₂O, 6 grams of Li form how much mass of Li₂O?
[tex]mass of Li_{2} O=\frac{6 grams of Lix60 grams of Li_{2} O}{28 grams of Li}[/tex]
mass of Li₂O= 12.857 grams
Finally, 12.857 grams of Li₂O are formed when 6 grams of Li reacts.
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what happens as a result of photoelectric effect
Electrons are emitted from the surface of a metal in photoelectric effect.
What is the photoelectric effect?The photoelectric effect is the emission of electron from the surface of a metal when light is shone on the surface..
For electrons to be emitted, the light must have a certain frequency known as threshhold frequency.
Therefore, electrons are emitted from the surface of a metal in photoelectric effect.
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The compound that does not conform to the law of constant proportion law is is CO2 whose ratio by mass ought to be 8:3 and not 3:4.
What is the law of constant proportions?The law of constant proportions portrays the ideas that the composition of a pure sample of a substances has a fixed composition by mass.
Following the law of constant proportion, the compound that does not conform to this law is is CO2 whose ratio by mass ought to be 8:3 and not 3:4.
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Answer:
your cool
Explanation:
help for number 3 pls
Answer:
a. name of element is copper it's proton is 29 neutron is 34 and electron is 29
b.name of element is sodium it's proton is 11 neutron is 12 and electron is 11
c.name of element is chlorine it's proton is 17 neutron is 18 and electron is 17
d.name of element is iron it's proton is 26 neutron is 30 and electron is 26
Which ideas held by the ancient Greeks have been at least partially supported by scientific experiments, calculations, and observations made throughout history?
The ideas held by the ancient Greeks have been at least partially supported by scientific experiments include:
Light is a wave or disturbance that travels through spaces in the air.Light is a substance carrying particles that flow from a light source.What is Wave-particle duality?This is a phenomenon in which a quantum entity can be referred to as a wave or a particle.
An example is light which has this feature and has been severally proven through series of experiments such as photoelectric effects etc.
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what is the reaction for C + H₂ → CH4
Answer:
synthesis/combination
Explanation:
There are 5 main types of reactions.
combination/synthesis, decomposition, single-replacement, double-replacement, and combustion
synthesis/combination - A+B → AB
Decomposition - AB → A+B
single- replacement - A + BC → AC + B
double replacement - AB + CD → AD + CB
combustion - example - C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
If you wanted to balance this
the answer would be [tex]C + 2H_{2}[/tex] → [tex]CH_{4}[/tex]
What energy transformations occur when a person turns on a lightbulb by
connecting its circuit to a battery? List and describe transformations involving three
types of energy. (3 points)
Explanation:
chemical energy electric energy light energy heat energy
When a person turns on a lightbulb by connecting its circuit to a battery, several energy transformations occur. There are three types of energy transformations involved in the process.
1. Electrical to Light Energy:
When the circuit is completed by connecting the lightbulb to the battery, electrical energy from the battery flows through the circuit and enters the lightbulb. Inside the lightbulb, this electrical energy is transformed into light energy. The lightbulb contains a filament that heats up due to the flow of electricity, causing it to emit light. Therefore, electrical energy is transformed into light energy in this process.
2. Chemical to Electrical Energy:
The battery stores chemical energy, which is converted into electrical energy when the circuit is closed. Inside the battery, chemical reactions occur, generating a flow of electrons. These electrons create an electric current, which then travels through the circuit and powers the lightbulb. So, in this step, chemical energy from the battery is transformed into electrical energy.
3. Chemical to Heat Energy:
As electrical energy passes through the filament in the light bulb, some of it is converted into heat energy. The resistance of the filament causes it to heat up, and this heat energy is released into the surroundings. This is why a light bulb feels warm when it has been turned on for some time. Thus, in this step, electrical energy is transformed into heat energy.
Thus,electrical energy from the battery is transformed into light energy in the light bulb. Chemical energy in the battery is converted into electrical energy to power the lightbulb. Electrical energy passing through the light bulb's filament is transformed into heat energy.
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A scientist is measuring the pressure that is exerted by each of the following gases in the atmosphere: carbon
dioxide, oxygen, and nitrogen. Which term most likely describes what she is measuring?
-final pressure
-atmospheric pressure
-combined pressure
-partial pressure
The term that describes what she is measuring is called partial pressure.
What is the Dalton law of partial pressure ?From the Dalton's law of partial pressure, the total pressure of a gas is regarded as the sum of the partial pressures of all the gases in the mixture.
As such, each of the gases; carbon dioxide, oxygen, and nitrogen all possess partial pressures thus the term that describes what she is measuring is called partial pressure.
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The group of atoms that is responsible for the characteristic properties of a family of organic compounds is called a/an ________ group. Multiple Choice hydrocarbon functional ether enzyme polyatomic ion
The group of atoms that is responsible for the characteristic properties of a family of organic compounds is called a functional group.
Functional groups are groups of one or extra atoms with exclusive chemical homes regardless of what's connected to them. The atoms of practical agencies are certain via covalent bonds with one another and with the relaxation of the molecule.
Functional groups include:
hydroxyl, methyl, carbonyl, carboxyl, amino, phosphate, sulfhydryl.An atom or institution of atoms that replaces hydrogen in a natural compound that defines the shape of a family of compounds and determines the properties of the family.
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PLEASE HELP ME ANSWER THESE QUESTIONS!
1.) Calculate the number of moles (n) in 14.0 g of sodium hydroxide
(NaOH)
2.) Calculate the number of moles (n) in 0.05 g of sulfuric acid
(H2SO4)
3.) What is the mass of 4.75 moles of lead atoms
4.) What is the mass 0.04 mol of hydrochloric acid (HCl)
5.) How many atoms are there in 5.00 mol of silver
6.) How many atoms are there in 3 X 10 - 10 mol of copper
Answer:
1. 0.35 moles NaOH
2. [tex]5.10x10^{-4}[/tex] moles [tex]H_2SO_4[/tex]
3. 505.4 g Pb
4. 1.46 g HCl (if that is wrong it's 1.5 g HCl due to sig figs)
5. [tex]3.01x10^{23}[/tex] atoms of Ag
6. [tex]2x10^{-10}[/tex] atoms of Cu
Explanation:
1. The mass of NaOH is 40g. 22.99(Na)+16(O)+1.01(H)=40 g
14 g NaOH *[tex]\frac{1 mol NaOH}{40 g NaOH}[/tex] = 0.35 moles of NaOH
2. Mass of [tex]H_{2} SO_{4} = 2(1.01)+32.06+4(16) = 98.08[/tex]
0.05 g [tex]H_2SO_4[/tex] ×[tex]\frac{1 mol H_2SO_4}{98.08g H_2SO_4} = 5.10 x10^{-4}[/tex]
3. mass of Pb = 106.4 g
4.75 moles Pb×[tex]\frac{106.4 g Pb}{1 mol Pb} =505.4 g Pb[/tex]
4. mass of HCl = 1.01 +35.45 = 36.36 g
0.04 mol HCl x [tex]\frac{36.46 g HCl}{1 mol HCl} = 1.456 = 1.5[/tex]
5. 5.00 mol Ag x[tex]\frac{6.022x10^{23} atoms }{1mol Ag} = 3.01x10^{24} atoms[/tex]
6. [tex]3x10^{-10} moles[/tex] Cu x[tex]\frac{6.022x10^{23} atoms}{1 mol Cu} = 1.8668x10^{14}= 2x10^{14}[/tex] atoms of Cu
In the laboratory, a student adds 55.7 mL of water to 17.6 mL of a 0.718 M hydrobromic acid solution. What is the concentration of the diluted solution
Answer: The concentration of the diluted solution is 0.17M.
Explanation:
The equation for diluted solutions is shown as: [tex]M_{s} V_{s} =M_{d} V_{d}[/tex].
~M= Molarity (labeled as M)
~V=Volume (in L)
~s= stock solution (what you started with)
~d= diluted solution (what you finish with)
Now that we have that down, let's plug in our data!
[tex]0.718M*17.6mL=M_{d} *73.3mL[/tex]
(I put [tex]V_{d}[/tex] as 73.3 because you are adding 55.7mL to 17.6mL, meaning that you have to add that to get [tex]V_{d}[/tex]. In other words, [tex]17.6mL+55.7mL=73.3mL[/tex])
There is a little problem here though. The volume is not in liters. But no worries, we can just convert it by dividing it by 1000.
[tex]17.6mL/1000=0.0176L[/tex] [tex]73.3mL/1000=0.0733L[/tex]
Now that we have both volumes in liters, we can plug them in correctly.
[tex]0.178M*0.0176L=M_{d} *0.0733L[/tex]
[tex]M_{d} =\frac{0.718M*0.0176L}{0.0733L}[/tex] [tex]M_{d} =0.17M[/tex]
With all of this shown, we now know that the concentration of the diluted solution is 0.17M.
I hope this helps! Pls mark brainliest!! :)
how to balance this equation NH4OH+H3PO4=(NH4)3PO4+H2O with explainatio please
Answer:
3 NH4OH (l) + H3PO4 (aq) → (NH4)3PO4 (aq) + 3 H2O (l)
Explanation:
This is an acid-base reaction (neutralization): NH4OH is a base, H3PO4 is an acid
Answer:
To balance the equation place a coefficient 3 in front of NH4OH in the reactants and another 3 in front of H2O.
3 NH4OH (l) + H3PO4 (aq) → (NH4)3PO4 (aq) + 3 H2O (l)
Explanation:
To balance equations you are only allowed to change coefficients and not subscripts. You need to make sure you have the same amount of each element on both sides of the equation, sketching a table may help.
explain why molten sodium chloride conducts electricity,but solid sodium chloride does not
Answer:
because molten sodium gives electricity too choloride
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comparison study on kerala and himachal pradesh on water and soil pls write water and soil separately, pls answer fast 20 points u will get
The main difference between the waters of Kerala and Himachal Pradesh is the presence of water lakes, and ponds in Kerala and the Himalayan Ranges and Rivers in Himachal Pradesh
The main difference between the soil of Kerala and Himachal Pradesh is that there is the presence of mountain soils in Himachal Pradesh, while Kerala has coastal allu-vium, mixed allu-vium, and acid saline, Kari, laterite, red, hill, black cotton, and forest soils.
What is a Comparision?This refers to the side-by-side view of two or more entities in order to find their differences and similarities.
Hence, we can see that Kerala and Himachal Pradesh are both in India and they are in different regions, which accounts for their differences in water and soil as listed above.
Read more about water and soil here:
https://brainly.com/question/20848502
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