Chemistry, 16.03.2020 21:06 josuealejandro9632

Be sure to answer all parts. Acetone is one of the most important solvents in organic chemistry. It is used to dissolve everything from fats and waxes to airplane glue and nail polish. At high temperatures, it decomposes in a first-order process to methane and ketene (CH2═C═O). At 600°C, the rate constant is 8.7 × 10−3 s−1. (a) What is the half-life of the reaction? Give your answer in scientific notation. 7.97 × 10 s (b) How long does it take for 34% of a sample of acetone to decompose? s (c) How long does it take for 89% of a sample of acetone to decompose? Give your answer in scientific notation. × 10 s

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Answer from: tmrsavage02p7cj16

a) 79.66 seconds is the half-life of the reaction.

b) It will take $4.776\times 10^1$ seconds for 34% of a sample of an acetone to decompose.

c) It will take $2.537\times 10^2$ seconds for 89% of a sample of an acetone to decompose.

Explanation:

The decomposition of acetone follows first order kinetics

The rate constant of the reaction = k = $8.7\times 10^{-3} s^{-1}$

Half life of the reaction = $t_{1/2}$

For the first order kinetic half life is related to k by :

$t_{1/2}=\frac{0.693}{k}$

$t_{1/2}=\frac{0.693}{8.7\times 10^{-3} s^{-1}}=79.66 s=7.966\times 10^1 s$

79.66 seconds is the half-life of the reaction.

Let the initial concentration of acetone be = [A_o]

Final concentration of acetone left after t time = [A]

$A=(100\%-34\%)[A_o]=66\%[A_o]=0.66[A_o]$

For the first order kinetic :

$[A]=[A_o]\times e^{-kt}$

$0.66[A_o]=[A_o]\times e^{-8.7\times 10^{-3} s^{-1}\times t}$

Solving for t;

t=47.76 s

It will take 47.76 seconds for 34% of a sample of an acetone to decompose.

Let the initial concentration of acetone be = [A_o]

Final concentration of acetone left after t time = [A]

$A=(100\%-89\%)[A-o]=11\%[A_o]=0.11[A_o]$

For the first order kinetic :

$[A]=[A_o]\times e^{-kt}$

$0.11[A_o]=[A_o]\times e^{-8.7\times 10^{-3} s^{-1}\times t}$

Solving for t;

$t=2.537\times 10^2 s$

It will take $2.537\times 10^2$ seconds for 89% of a sample of an acetone to decompose.

Answer from: Quest

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

Answer from: Quest

If the water vapor content stays the same and the temperature drops, then the relative humidity increases. its vise versa.if the water vapor content stats the same and the temperature rises, the relative humidity decreases. so, yes, i'd say that temperature and humidity have a strong relationship.

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