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2 years ago

10

Which of the following substances will cause the greatest temperature change if the same amount of each substance is added to 1.

0 kg of water?
A. Na2SO4
B. KBr
C. C6H12O6
D. FeCl3

2 answers:

zavuch27 [327]2 years ago

8 0

D

is the answer to this question

Masja [62]2 years ago

5 0

The answer is FeCl3, just took the quiz

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2 years ago

How many moles of Cl2 will produce 0.35 miles of NaCl when reacted with excess Na?

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3 years ago

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Rate equation for first order reaction is as follows:

$t=\frac{2.303}{k}log\frac{A_{0}}{A_{t}}$

Here, k is rate constant of the reaction, t is time of the reaction, $A_{0}$ is initial concentration and $A_{t}$ is concentration at time t.

The rate constant of the reaction is $0.1 day^{-1}$ .

(a) Let the initial concentration be 100, If 90% of the chemical is destroyed, the chemical present at time t will be 100-90=10, on putting the values,

$t=\frac{2.303}{k}log\frac{A_{0}}{A_{t}}=\frac{2.303}{0.1 day^{-1}}log\frac{100}{10}=23.03 days$

Thus, time required to destroy 90% of the chemical is 23.03 days.

(b) Let the initial concentration be 100, If 99% of the chemical is destroyed, the chemical present at time t will be 100-99=1, on putting the values,

$t=\frac{2.303}{k}log\frac{A_{0}}{A_{t}}=\frac{2.303}{0.1 day^{-1}}log\frac{100}{1}=46.06 days$

Thus, time required to destroy 99% of the chemical is 46.06 days.

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Thus, time required to destroy 99.9% of the chemical is 69.09 days.

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2 years ago