M Prep | MCAT 2015 Question of the Day - Prep, Practice Questions, and More!

Q:

While half-life is a common concept in chemistry, a third-life is also sometimes used. It is defined as the time for a substance to be reduced to a third of its initial value. If a substance has a third-life of 10 minutes and we start with 1000 g of a substance, approximately how much will be left in 30 minutes?

A

40 g

B

75 g

C

87 g

D

101 g