Question

1)The data below were collected for the following reaction:
CH3Cl(g)+3Cl2(g)→CCl4(g)+3HCl(g)

[CH3Cl](M)	[Cl2](M)	Initial Rate (M/s)
0.050	0.050	0.014
0.100	0.050	0.029
0.100	0.100	0.041
0.200	0.200	0.115

A

Calculate the value of the rate constant, k.

Express your answer using two significant figures.

B

What is the overall order of the reaction?

Express your answer using two significant figures.

2)

t (s)	[A] (M)	ln[A]	1/[A]
0.00	0.500	−0.693	2.00
20.0	0.389	−0.944	2.57
40.0	0.303	−1.19	3.30
60.0	0.236	−1.44	4.24
80.0	0.184	−1.69	5.43

What is the activation energy of this reaction?

Express your answer to three significant figures and include the appropriate units.

3)

The decomposition of XY is second order in XYand has a rate constant of 7.08×10⁻³ M−1⋅s−1at a certain temperature.

-

If the initial concentration of XY is 0.140 M , how long will it take for the concentration to decrease to 6.80×10⁻² M ?

Express your answer using two significant figures.

4)

The rate constant of a chemical reaction increased from 0.100 s−1 to 2.70 s−1 upon raising the temperature from 25.0 ∘C to 55.0 ∘C .

A"SOLVED"

−3.07×10−4

K−1

B

Calculate the value of ln(k1k2) where k1 and k2 correspond to the rate constants at the initial and the final temperatures as defined in part A.

Express your answer numerically

C

What is the activation energy of the reaction?

Express your answer numerically in kilojoules per mole.

5)

The rate constant (k) for a reaction was measured as a function of temperature. A plot of lnk versus 1/T(in K) is linear and has a slope of−1.02×10⁴ K .

Calculate the activation energy for the reaction.

Express your answer with the appropriate units.

6)

Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. The osmotic pressures required for this process can be as high as 19.1 atm . What would the molar concentration of the tree sap have to be to achieve this pressure on a day when the temperature is 28 ∘C ?

Answer 1