Chemistry, 14.09.2019 10:30 kaur16435

In a first-order decomposition reaction. 20.8% of a compound decomposes in 7.8 min. how long (in min) does it take for 88.2% of the compound to decompose?

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Answer from: jackchelly

t = 71.47 min

Explanation:

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

[A_t] is the concentration at time t

[A_0] is the initial concentration

Given:

20.8 % is decomposed which means that 0.208 of [A_0] is decomposed. So,

$\frac {[A_t]}{[A_0]}$ = 1 - 0.208 = 0.792

t = 7.8 min

$\frac {[A_t]}{[A_0]}=e^{-k\times t}$

$0.792=e^{-k\times 7.8}$

k = 0.0299 min⁻¹

Also,

Given:

88.2 % is decomposed which means that 0.882 of [A_0] is decomposed. So,

$\frac {[A_t]}{[A_0]}$ = 1 - 0.882 = 0.118

t = ?

$\frac {[A_t]}{[A_0]}=e^{-k\times t}$

$0.118=e^{-0.0299\times t}$

t = 71.47 min

Answer from: Quest

chemical energy is stored in the chemical bonds of atoms and molecules. it can only be seen when it is released in a chemical reaction. when chemical energy is released, the substance from which the energy came is often changed into an entirely different substance.

this chemical reaction releases energy in the form of light and heat. chemical energy is the potential energy stored in the arrangement of atoms within molecules. breaking chemical bonds requires energy, while forming new chemical bonds releases energy.

the atp molecule can store energy in the form of a high energy phosphate bond joining the terminal phosphate group to the rest of the molecule. in this form,energy can be stored at one location, then moved from one part of the cell to another, where it can be released to drive other biochemical reactions.

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

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In a first-order decomposition reaction. 20.8% of a compound decomposes in 7.8 min. how long (in min...

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