Answer:
The pH of the solution is 2.873
Explanation:
Given:
Pka = 3.89pH of a 0.0140 MLet the solution of the uric acid be HA. We have to set up the ICE table as follows;
HA(aq) + H20(l) ⇄ H3O^+(aq) + A^-
I 0.0140 0 0
C -x +x +x
E 0.0140 - x x x
Ka = 10^-(pka)
= 10^-3.89
= 1.28 x 10^-4
Ka = [H+] * [A-]/[HA]
=> 1.28 x 10^-4 = [H+]^2 / 0.0140
=>[H+]^2 = 1.28 x 10^-4 x 0.014
=> [ H+] = 1.338656 x 10^-3
so pH = - log [ H+ ] = - log 1.338656 x 10^-3
= 3 - log 1.338656
= 2.87333101111
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0.198 kg of ethyl alcohol, C2H5OH, in 0.500 L of solution, the concentration of ethyl alcohol in vodka .0
8.59 is the concentration of ethyl alcohol when 0.198 kg of ethyl alcohol.
Define the molarity of a solution.
Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.
Given data:
Volume of solution = 0.500 L
Given the mass of [tex]C_2H_5OH[/tex]= 0.198 kg= 198g
Molar mass of [tex]C_2H_5OH[/tex] = 46.07 g/mol
Moles of [tex]C_2H_5OH[/tex] = 4.297807684
[tex]Molality = \frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}[/tex]
[tex]Molality = \frac{4.297807684}{0.500 L}[/tex]
Molality = 8.595615368 =8.59M
Hence, 8.59 is the concentration of ethyl alcohol when 0.198 kg of ethyl alcohol.
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The company claims that the mineral supplement can effectively prevent the common cold.A scientist disputes the claim, saying and error exists in the setup of the groups for the investigation. Which change to the investigation would remove the source of this error?
A change to the investigation which would remove the source of this error is to test a fourth group in which the people do not receive the mineral supplements.
What is a Scientific method?
This is the experimental techniques employed in science and involves hypothesis, observations etc.
Removing an error in a scientific method involves repeated experiments and using a large sample which is why the fourth group should be taken into consideration.
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25cc of 5 % NaOH solution neutralized 30cc of h2sO4 solution. Whatis normality of H2SO4?
The normality of the H₂SO₄ that reacted with 25cc of 5 % NaOH solution is 1.1 N.
What is the molarity of 5% NaOH?The molarity of 5% NaOH is 1.32 M
25 cc of NaOH neutralized 30cc of H₂SO₄ solution.
Equation of reaction is given below:
2 NaOH + H₂SO₄ ---> Na₂SO₄ + 2 H₂OMolarity of H₂SO₄ = 1.32 x 1 x 25/(30 x 2) = 0.55 M
Normality = Molarity × moles of H⁺ ions per mole of acidmoles of H⁺ ions per mole of H₂SO₄ = 2
Normality of H₂SO₄ = 0.55 x 2 = 1.1 N
In conclusion, the normality of an acid is determined from the molarity and the moles of H⁺ ions per mole of acid.
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A section of a high speed test track is circular with a radius of curvature R = 1860 m.
At what angle of θ should the track be inclined so that a car traveling at 61.0 m/s (136 mph) would keep moving in a circle if there is oil on that section of the track, i.e., it would not slip sideways even with zero friction on that section. (Hint: The car's vertical acceleration is zero.)
Using Newton's second law, the car is experiencing a net force parallel to the banked curve such that
[tex]mg \sin(\theta) = \dfrac{mv^2}r \implies \sin(\theta) = \dfrac{v^2}{rg}[/tex]
where [tex]v[/tex] is the tangential speed of the car and [tex]r[/tex] is the radius of the curve. Solve for [tex]\theta[/tex] :
[tex]\sin(\theta) = \dfrac{\left(61.0\frac{\rm m}{\rm s}\right)^2}{(1860\,\mathrm m)g} \approx 0.204 \implies \theta = \sin^{-1}(0.204) \approx \boxed{11.8^\circ}[/tex]
How much energy is needed to melt 230 g of ammonia (NH3)? (Heat of fusion is 5.66 kJ/mol)
Give your answer in units of kJ with correct significant figures.
Moles of ammonia
Given mass/Molar mass230/1713.5mol1mol requires 5.66KJ energy
13.5mol requires
5.66(13.5)76.4KJWhat volume of water vapor would be produced from the combustion of 815.74 grams of propane (C3H8) with 1,006.29 grams of oxygen gas, under a pressure of 1.05 atm and a temperature of 350. degrees C? Given:
C3H8(g) + 5 O2(g) ---> 3 CO2(g) + 4 H2O(g)
(OR C3 H8 ("g") + 5 O2 ("g") right arrow 3 C O2 ("g") + 4 H2O ("g")
Do not type units with your answer
3940.2 is the volume of water vapour that would be produced from the combustion of 815.74 grams of propane ([tex]C_3H_8[/tex]) with 1,006.29 grams of oxygen gas, under a pressure of 1.05 atm and a temperature of 350. degrees C.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Stoichiometric calculations:
[tex]C_3H_8(g) + 5 O_2(g)[/tex]→ [tex]3 CO_2(g) + 4 H_2O(g)[/tex]
From the equation of the reaction, the mole ratio of propane to oxygen is 1:5.
Mole of 815.74 grams of propane = [tex]\frac{ 815.74}{44.1 }[/tex]
Mole of 815.74 grams of propane = 18.49750567 moles
Mole of 1,006.29 grams of oxygen =[tex]\frac{ 1,006.29}{32 }[/tex]
Mole of 1,006.29 grams of oxygen = 31.4465625 moles
Going by the mole ratio, it appears propane is limiting while oxygen is in excess.
From the equation, 1 mole of propane produces 4 moles of water vapour. Thus, the equivalent mole of water vapour will be:
18.49750567 moles x 4 = 73.99 moles.
Using the ideal gas equation:
PV = nRT
v = (73.99 x 0.08206 x 623) ÷ 0.96
v = 3940.2
Hence, 3940.2 is the volume of water vapour that would be produced from the combustion of 815.74 grams of propane ([tex]C_3H_8[/tex]) with 1,006.29 grams of oxygen gas, under a pressure of 1.05 atm and a temperature of 350. degrees C.
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3.4x10^4=
In ordinary numbers
3.4x10^4 = 34000
3.4×104 = 3.4 ×10000 = 34×1000=34000
What is a ordinary number?In linguistics, ordinal integers or ordinal digit words are terms representing place or rank in sequential ordering; the order may be of a size, significance, record, and so on (e.g., "third", "tertiary").
They vary from cardinal digits, which mean quantity (e.g., "three") and other kinds of numerals.
Thus, 34000 is the answer.
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A4. Lead oxides are environmental pollutants. (a) Name the source of these pollutants. (b) What is the major adverse effect on humans?. (c) State the measures that have been put in place in order to avoid this kind of pollution..... (d) (1) Explain the meaning of the term global warming. (ii) Name a pollutant which causes global warming.
Answer:
A
Explanation:
bc u have to think about it
11 . A guest orders a drink that contains 4 1/2 ounces of 80-proof liquor. Approximately how many drinks does this beverage contain?
From the calculations that have been done, there are 3 drinks.
How many drinks are there?The information that we have been provided here is very important. We can obtain the amount of alcohol by looking at the fact that it contains 80-proof liquor.
This 80-proof liquor. is an equivalent of 40% alcohol this means that there is 1.5 ounce of distilled spirit.
Thus, the number of drinks there is;
4.5/1.5 = 3
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determine the mass of the sample
We know that 1 kmol = 1000 mol, so 2.43 kmol = 2430 mol.
The atomic mass of sulfur is 32.06 amu.The atomic mass of oxygen is 15.9994 amu.This means the formula mass of sulfur trioxide is
[tex]32.06+3(15.9994)=80.0582 \text{ g/mol}[/tex]
Therefore, the mass is
[tex](80.0582)(2430)=\boxed{1.95 \times 10^{5} \text{ g (to 3 sf)}}[/tex]
Question 1
One mole of C_2H_6OC
2
H
6
O has two moles of Carbon (C), six moles of Hydrogen (H) and one mole of Oxygen (O). How many moles of Hydrogen is in 0.2 moles of C_2H_6OC
2
H
6
O?
In the given compound, 0.2 mole of C₂H₆O will contain 1.2 moles of hydrogen.
chemical compoundIn the balanced chemical compound C₂H₆O, we can deduce the following;
1 mole of C₂H₆O contains 6 moles of hydrogen
0.2 mole of C₂H₆O = ?
= 0.2 x 6 moles = 1.2 moles of hydrogen
Thus, in the given compound, 0.2 mole of C₂H₆O will contain 1.2 moles of hydrogen.
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Oxygen decays to form nitrogen. 15 8 O → 15 7 N + 0 1 e This type of nuclear decay is called
The type of nuclear decay in which Oxygen decays to form nitrogen is beta plus decay.
What is a beta plus decay?A beta plus decay is a type of decay in which a proton in an element disintegrates to produce a neutron resulting in a decrease in the atomic number of the radioactive element.
In the given equation below:
[tex]^{15}_{7}O \rightarrow ^{15}_{7}N + ^{0}_{1}e[/tex]Oxygen decays to form nitrogen due to a decrease in atomic number.
This is an example of beta plus decay.
In conclusion, oxygen decays to form nitrogen beta plus decay.
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If a balloon containing 0.342 moles of gas is left out in sun, the pressure is 1.54 atmospheres. If the temperature is 300 K, what is the volume of the balloon? Note R is 8.314 L kPa mol-1K-1 or 0.821 L atm mol-1K-1 .
Answer:
54.7 L
Explanation:
To find the volume, you need to use the Ideal Gas Law. The formula looks like this:
PV = nRT
In this formula,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = number of moles
-----> R = constant (0.821 L*atm/mol*K)
-----> T = temperature (K)
You need to use the second R constant because the pressure is measured in atmospheres (atm) and not kPa. Because you have the all of the necessary variables except for volume, you can substitute them into the Ideal Gas Law formula and solve.
P = 1.54 atm R = 0.821 L*atm/mol*K
V = ? L T = 300 K
n = 0.342 moles
PV = nRT
(1.54 atm)V = (0.342 moles)(0.821 L*atm/mol*K)(300 K)
(1.54 atm)V = 84.2346
V = 54.7 L
What is the definition of specific heat? O A. The heat required to break the molecular bonds within a substance B. The total amount of energy contained within 1 mole of a substance C. The heat needed to raise the temperature of 1 g of a substance 1°C D. The temperature change between the melting and boiling points of a substance N What is the definition of specific heat ? O A. The heat required to break the molecular bonds within a substance B. The total amount of energy contained within 1 mole of a substance C. The heat needed to raise the temperature of 1 g of a substance 1 ° C D. The temperature change between the melting and boiling points of a substance N
Answer:
C
Explanation:
C . specific heat = J / gm-C
Do the ch3f molecules appear to attract each other much? briefly describe their interaction.
Neither attract much nor allows it be free.
How the molecules behave in such way?
Because fluorine has a higher electronegativity than carbon and hydrogen, CH3F possesses a non-zero dipole moment. As a result, fluorine draws a partial negative charge whereas other atoms (such as carbon or hydrogen) draw a partial positive charge, leading to a non-zero dipole moment in CH3F. Lewis' structure, CH3F, is made up of one carbon atom, three hydrogen atoms, and one fluorine atom. Carbon is the key atom in the CH3F lewis structure because it is the least electronegative. The CH3F lewis dot structure consists of 3 lone pairs and a total of 4 bound pairs.
Properties of CH3F
It molar mass is 34.03 g/mol.The density of CH3F is 1.4397 g/L and 0.557 g/cm³ at saturated pressure and temperature.The melting point of CH3F is -137.8ºC and the Boiling point is -78.4ºC.Its vapor pressure is 3.3 MPa.Its IUPAC name is Fluoromethane.Know more about carbon here:
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If 3.66•10^23 molecules of a substance have a mass of 24.31g, what is the molar mass of the substance?
Answer:
Molar mass of substance = 40.0 g/mol
Explanation:
• First calculate the number of moles in 3.66 × 10²³ :
no. of moles = number of particles / Avogadro's Number
= (3.66 × 10²³) / (6.022 × 10²³)
= 0.6078 mol
• Now use the following equation to calculate the molar mass:
Molar mass = mass of substance / no. of moles
= 24.31 / 0.6078
= 40.0 g/mol
If 45 g of O2 gas in a 500 mL container is exerting a pressure of 5.2 atm, what temperature is the gas?
If 45 g of O2 gas in a 500 mL container is exerting a pressure of 5.2 atm, 22.53K is the temperature in the gas.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
First, calculate the moles of the gas using the gas law,
PV=nRT, where n is the moles and R is the gas constant. Then divide the given mass by the number of moles to get molar mass.
Given data:
P= 5.2 atm
V= 500 mL =0.5 L
n=?
R= [tex]0.082057338 \;L \;atm \;K^{-1}mol^{-1}[/tex]
T=?
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
[tex]Moles = \frac{45 g}{32}[/tex]
[tex]Moles = \frac{45 g}{32}[/tex]
Moles = 1.40625
Putting value in the given equation:
[tex]\frac{PV}{RT}=n[/tex]
[tex]1.40625= \frac{5.2 \;atm\; X \;0.5 \;L}{0.082057338 \;L \;atm \;K^{-1}mol^{-1} X T}[/tex]
T= 22.53167034 K= 22.53K
Hence, If 45 g of O2 gas in a 500 mL container is exerting a pressure of 5.2 atm, 22.53K is the temperature in the gas.
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I NEED HELP!!!
How much heat (kJ) is needed to raise the temperature of 100.0 grams of water from 290.0 K to 325.0 K?
(Specific Heat of Water = 4.18 J/g °C)
• 10450
• 146
• 14630
• 10.5
• 14.6
Answer:
Explanation:
Formula
Heat = m * c * delta t
t = temperature in centigrade.
The first thing you have to do is convert kelvin degrees to centigrade. The conversion factor is - 273. The formula is degrees centigrade = degrees kelvin - 273. It is easier to understand with a couple of examples.
290o K = 290 - 273 = 17325. K = 325 - 273 = 52Solution
Heat = 100.0 grams * 4.18 J/g*C * (52 - 17)
Heat = 100 * 4.18 * 35
Heat = 14630 Joules
But you want kj
Heat = 14630 / 100 = 14.63
Answer
Heat = 14.6 kj
screen shot is attached , please help
Answer: 0.680 mol
Explanation:
From the coefficients of the equation, we know that for every 3 moles of carbon dioxide produced, 5 moles of oxygen gas are consumed.
So, the answer is (5/3)(0.408) = 0.680 mol (to 3 sf)
What part of the scientific method involves controlling variables while testing a hypothesis? (2 points) Select one: a. Analyzing data b. Conducting an experiment c. Drawing a conclusion d. Making observations
Answer:
D
Explanation:
best choice, makes the most sense
In the scientific method, conducting an experiment involves designing and performing controlled experiments to test a hypothesis and the correct option is option B.
Scientists manipulate the independent variable while controlling other variables (dependent and controlled variables) to observe and measure the effect on the dependent variable.
By controlling variables, scientists can isolate the factors that influence the outcome, ensuring that any observed changes are a result of the manipulated variable and not other unrelated factors. This step allows for the collection of reliable data, which is essential for drawing meaningful conclusions based on the evidence gathered from the experiment.
Thus, the ideal selection is option B.
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a student collects 0.36 mol of methane gas (CH4) at STP. Determine the following mass of the methane gas
5.7744 g is the mass of the methane gas.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
[tex]0.36 mol = \frac{mass}{16.04 g/mol}[/tex]
Mass =5.7744 g
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A 345.21 g sample of a compound was found to contain 200.50 g of carbon and
144.71 g of hydrogen. What is the percentage composition of the compound?
Answer:
See below
Explanation:
carbon % = 200.5 / 345.21 * 100% = 58.1 %
hydrogen% = 144.71 / 345.21 *100% = 41.9 %
Calculate the osmotic pressure of a 5% solution of glucose at 18°C.
Answer:
6.97 atm is the osmotic pressure.
Forwarded
6. Organic compound with triple
bonds are referred to as ?
7. Organic compounds with - 0 - as
their functional group are referred to
as — .
8. This kind of organic compound
structure is referred to as
9. Organic compound with this
structure are referred to as - .
10. When one hydrogen atom is
removed from an alkane compound,
this process is referred to as - .
11. Addition of an halogen to an
organic compound is - .
Answer:
organic compounds with triple bonds are alkynes
A rate constant obeys the Arrhenius equation, the factor A being 2.2 10^13 s-1 and the
activation energy being 150. kJ mol-1. What is the value of the rate constant at 227C, in
s-1?
4.743 x [tex]10^{-3}[/tex] s-1 is the value of the rate constant.
What is an Arrhenius equation?The Arrhenius equation describes the relationship between the rate of reaction and temperature for many physical and chemical reactions.
As per Arrhenius equation,
k = Ae-Ea÷RT
T = 227 = 500.15 K
R = 0.008314 kJ/K mol
Ea = 150 kJ/mol
Ea÷RT
= 150÷(0.008314 x 500.15)
= 36.073
k = Ae-36.073 = (2.2 x [tex]10^{13}[/tex] s-1) (2.156 x [tex]10-{16}[/tex])
k = 4.743 x [tex]10^{-3}[/tex] s-1
So, the correct answer is option d) i.e. 4.7 x [tex]10^{-3}[/tex] s-1
As per Arrhenius equation,
k = Ae-Ea/RT
T = 227 = 500.15 K
R = 0.008314 kJ/K mol
Ea = 150 kJ/mol
Ea÷RT = 150÷(0.008314 x 500.15) = 36.073
k = Ae-36.073 = (2.2 x [tex]10^{13}[/tex] s-1)(2.156 x [tex]10^{-16}[/tex])
k = 4.743 x [tex]10^{-3}[/tex] s-1
Hence, 4.743 x [tex]10^{-3}[/tex] s-1 is the value of the rate constant.
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Which is a true statement about an exterior angle of a triangle?
• A. It is formed by two segments that are not sides of the triangle.
B. It is formed by two segments that are sides of the triangle.
C. It forms a linear pair with one of the interior angles of the triangle.
D. It is complementary to one of the interior angles of the triangle.
SUBMIT
The only true statement about an exterior angle of a triangle from the above is that it forms a linear pair with one of the interior angles of the triangle.
What is a triangle?A triangle can be defined as a one of the plane shapes which has three sides and three angles
So therefore, the only true statement about an exterior angle of a triangle from the above is that it forms a linear pair with one of the interior angles of the triangle.
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25g of gold with initially 27grade centigrade what is the final temperature uppon absorbing 2.3kj of heat
The final temperature of the mass of gold is 737 °C.
What is the specific heat capacity of gold?The specific heat capacity of gold is 0.126 J/g/K
The final temperature, T2 of the gold is calculated as follows:
T2 = T + Q/mc
where;
T is initial temperature, m is mass, and c is specific heat capacity of gold.
T2 = 27 + 2.3 x 1000/(25 x 0.126)
T2 = 737 °C
Therefore, the mass and heat capacity of gold determines its final temperature.
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Please help!! Thank you
Answer:
117.4 kJ (to 4 sf)
Explanation:
(141.3)(0.831) = 117.4 kJ (to 4 sf)
116) If the juice from a lemon is mixed with 55% water the lemon juice is the A) solution B) solute C) solvent D) None of the above
117) If the juice from a lemon is mixed with 55% water the water is the A) solution B) solute C) solvent D) None of the above
118) Which of the following is NOT c onsidered a solution? A) Gasoline B) Coca-Cola C) Water
119) Which statement is true? D) Bleach A) All mixtures are solutions. B) All mixtures are acidic. C) All solutions are mixtures. D) All solutions are alkalizing
120) Which of the following is considered a solution? A) 14k gold ring C) Sand in the ocean B) Wood chips on the ground D) Rocks in water
Answer:
Explanation:
d because a b and c is in correct
what is the study of matter called