172k views
3 votes
A reactant r is being consumed in a first-order reaction. What fraction of the initial R is consumed in 4.0 half-lives?

A. 0.063
B. 0.13
C.0.75
D.0.87
E.0.94

User Mankarse
by
8.6k points

1 Answer

5 votes

Final answer:

In a first-order reaction, the fraction of the initial reactant consumed in a given number of half-lives can be calculated using the equation (1/2)^n, where n is the number of half-lives. In this case, with 4 half-lives, the fraction consumed is 1/16 or 0.0625.

Step-by-step explanation:

A reactant R is being consumed in a first-order reaction. The fraction of the initial R consumed in 4.0 half-lives can be calculated using the equation:

Fraction consumed = (1/2)n

Where n is the number of half-lives. In this case, n = 4. Substituting the values into the equation, we get:

Fraction consumed = (1/2)4 = 1/16 = 0.0625

Therefore, the correct answer is A. 0.063.

User Userfuser
by
8.2k points

Related questions

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.