Author Question: For a particular first-order reaction, it takes 24 minutes for the concentration of the reactant to ... (Read 89 times)

abc · **on:** Nov 18, 2019

Question 1

The reaction that occurs in a Breathalyzer, a device used to determine the alcohol level in a person's bloodstream, is given below. If the rate of appearance of Cr2(SO4)3 is 1.64 mol min-1 at a particular moment, what is the rate of disappearance of C2H6O at that moment?

2K2Cr2O7 + 8H2SO4 + 3C2H6O → 2Cr2(SO4)3 + 2K2SO4 + 11H2O

◦ 1.09 mol min-1
◦ 4.92 mol min-1
◦ 2.46 mol min-1
◦ 0.547 mol min-1

Question 2

For a particular first-order reaction, it takes 24 minutes for the concentration of the reactant to decrease to 25% of its initial value. What is the value for rate constant (in s-1) for the reaction?
◦ 2.0 × 10-4 s-1
◦ 5.8 × 10-2 s-1
◦ 9.6 × 10-4 s-1
◦ 1.2 × 10-2 s-1

mcarey591 · **Reply #1 on:** Nov 18, 2019

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