The balanced equation says that 2 moles C₂H₆ and 7 moles O₂ react together, i.e. in a ratio of 7:2 or 3.5 moles of O₂ to C₂H₆.
With molar masses 30.07 g/mol (C₂H₆) and 31.998 g/mol (O₂), the given quantities amount to
(19 g C₂H₆) × (1/30.07 mol/g) ≈ 0.63 mol C₂H₆
(115 g O₂) × (1/31.998 mol/g) ≈ 3.59 mol O₂
Now, 0.63/2 ≈ 0.32, and for every 0.32 mol C₂H₆ consumed, the reaction requires 7×0.32 ≈ 2.2 mol O₂. Then in order to consume all of the C₂H₆, the reaction would need 2×2.2 ≈ 4.4 mol O₂, which we don't have.
In other words, we have too much C₂H₆ and not enough O₂, so O₂ is the limiting reactant.
Calculate the uncertainty in the velocity of a wagon of mass 4000kg whose position is known accurately of ±10m. class 11 Chemistry Structure of Atom chapter. I'll mark brainliest
Answer:
1.3×10−39ms−1
Explanation:
Phosphoric acid (H3PO4) is a triprotic acid because each of its three hydrogen atoms may dissociate in water. What mathematical relationship exists among the acid-dissociation constants (Ka1, Ka2, and Ka3) for phosphoric acid?
The formula that connects Ka1, Ka2, and Ka3 is the relation;
Ka = Ka1 * Ka2 * Ka3
What is the Ka?The Ka is defined as the acid dissociation constant of a solution. Now we have the triprotic acid called phosphoric acid. this implies that we have Ka1, Ka2, and Ka3.
Thus the formula that connects Ka1, Ka2, and Ka3 is the relation;
Ka = Ka1 * Ka2 * Ka3
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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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Considers both states of matter and describes the spacing and movement / forces between the particles. Explains a property of both solids and gases.
The particles in solids are not free to move because of strong attractive forces while gases are in constant random motion.
What is the nature of solids and gases?Solids are composed of particles which are arranged in a definite pattern.
The forces of attraction between the particles are strong and the particles are not free to move.
Solids have definite volume and shapes.
Gases are composed of particles which are in constant random motion and whose forces of attraction between the particles are weak.
Therefore, the particles in solids are not free to move because of strong attractive forces while gases are in constant random motion.
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Can someone help me with this??
Answer:
Explanation:
There are many observations, but the three that stand out for me are:
Leafs/plants are the original photocell. Phtocell generally refers to the conversion of sunlight energy into electrical energy. photosynthesis converts sunlight into chemical energy that uis stored in molecules such as carbohydrates.Plants make the oxygen that most life needs to survive. Photosynthesis removes carbon dioxide from the air. As a grennhouse gas, CO2 needs to be in balance with the rest of the planet. More plants are needed to removed CO2 released by buring of fossil fuels. Water is a feedstock in photosynthesis, so drought is a major threat.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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The empirical formula of styrene is CH; its molar mass is 104.1 g/mol. What is the molecular formula of styrene
This means the molar mass of CH is
[tex]12.011+1.00794=13.01894 \text{ g/mol}[/tex]
Dividing the given molar mass by this,[tex]\frac{104.1}{13.01894} \approx 8[/tex]
This means the molecular formula is [tex]\boxed{\text{C}_{8}\text{H}_{8}}[/tex]
A balloon can be used to explain the ideal gas laws. This system has 0.300 mol of nitrogen gas at 1064 torr pressure and takes up 11200 mL volume. What is the temperature of the system
The question is incomplete. Please read below to find the missing content.
The temperature will be A) 637 K (approx )
T = PV/nR , Ideal gas equation
Pressure (P) = 1024 (torr) * 1 atm / 760(torr)
P = 1.35 atm
Volume = 11200ml * (1l/100ml)
=11.2L
n = moles of nitogen = 0.300 mol
R = 0.0821 ( L- atm / mol.k)
Now put the values
T = 1.35 ( atm) * 11.2 (L) / 0.300 (mol) * 0.0821 ( L- atm / mol* k)
T = 15.12 / 0.0246 (1 / K)
= 615 K
Temprature will be 637 k ( approx)
Thermal energy refers back to the electricity contained within a gadget that is responsible for its temperature. warmness is the flow of thermal energy. A whole department of physics, thermodynamics, deals with how warmth is transferred among exceptional systems and how work is completed within the system (see the 1ˢᵗ regulation of thermodynamics).
One Celsius degree is an interval of 1 k, and 0 tiers Celsius is 273.15 k. An interval of 1 Celsius diploma corresponds to a c language of 1.8 Fahrenheit ranges at the Fahrenheit temperature scale.
Temperature is operationally described as the amount measured by way of a thermometer. It is proportional to the common kinetic energy of atoms and molecules in a system. Thermal equilibrium happens when our bodies are in touch with every other and might freely exchange strength.
A balloon can be used to explain the ideal gas laws. This system has 0.300 mol of nitrogen gas at 1064 torr pressure and takes up 11200 mL volume. What is the temperature of the system
A) 637 K
B) 490 K
C) 157 K
D) 780 K
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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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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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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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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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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.
Cylinder of air at 1.5 atm of pressure is kept at room temperature while a piston compresses the air from 40 l down to 10 ml. what will be the new air pressure?
The new pressure, P₂ is 6000 atm.
Calculation:Given,
P₁ = 1.5 atm
V₁ = 40 L = 40,000 mL
V₂ = 10 mL
To calculate,
P₂ =?
Boyle's law is applied here.
According to Boyle's law, at constant temperature, a gas's volume changes inversely with applied pressure.
PV = constant
Therefore,
P₁V₁ = P₂V₂
Put the above values in the equation,
1.5 × 40,000 = P₂ × 10
P₂ = 1.5 × 4000
P₂ = 6000 atm
Therefore, the new pressure, P₂ is 6000 atm.
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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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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 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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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.
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Calculate the number of moles in 8 g of water.
0.11 mole
O 0.44 mole
Q0.33 mole
0.22 mole
Answer:
refer the above attachment
help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
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:
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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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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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.
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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For a typical person who leads a sedentary lifestyle, a typical maximum oxygen intake level would be __________. A. 20 ml/kg/min B. 35 ml/kg/min C. 50 ml/kg/min D. 70 ml/kg/min Please select the best answer from the choices provided. A B C D
For a typical person who leads a sedentary lifestyle, a typical maximum oxygen intake level would be B. 35 ml/kg/min.
A sedentary lifestyle is a lifestyle type characterized by abundant sedentary behaviors. People who live a sedentary life often sit or lie down for most of the day in activities such as socializing, watching TV, playing video games, reading books, and using mobile phones and computers.
A sedentary lifestyle can lead to high blood pressure, low cholesterol, and elevated blood sugar levels, which damage the walls of blood vessels and increase the risk of a heart attack.
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the texture of ash left behind when cotton and rayon fibre burned
A sample of X is carefully weighed and put inside a sealed calorimeter. The calorimeter is heated electrically, and the amount of heat added determined by monitoring the electrical current used. The temperature of X is carefully measured, and from the temperature change and the amount of heat added the value of H
may be calculated.
Is this a physical or chemical property?
The value of the heat of combustion (H) that is calculated here is a chemical property.
What is the heat of combustion?The heat of combustion is the energy that is given up when a substance is burnt in a calorimeter. The heat of combustion is often measured by the use of a calorimeter.
Hence, the value of the heat of combustion (H) that is calculated here is a chemical property.
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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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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
A 21.5 g sample of nickel was treated with excess silver nitrate solution to produce silver metal and nickel(II) nitrate. The reaction was stopped before all the nickel reacted, and 36.5 g of solid metal (nickel and silver) is present. Calculate the mass of solid silver metal present in grams.
The mass of nickel is 36.5g metal.
Ni+2AgNO3 → Ni(NO3)2+2Ag
21.5g Ni / 58.69g = 0.366mol Ni
Ag = 107.87
N i= 58.69
But, 2molAg per 1 mol Ni, so, change in mass is more like...
Twice as many moles Ag as Ni, and then the mass relationship is 107.87g Ag / 58.69, but due to the 2Ag: 1Ni mol ratio, the change in mass is like:
107.87(2) / 58.69 = 3.68 times increase
So, the final mass of Ag is 3.68x, and the change in mass of Ni is x
36.5=(21.5-x)+(3.68x)
Solve for x
x=5.597
3.68x=g Ag
3.68(5.597)=20.59
21.5 - x = g Ni after reaction
21.5 - 5.597 = 15.903g Ni
20.59g Ag + 15.903g Ni = 36.5g metal
The mass of nickel is 36.5g metal.
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