# Question #568a2

##### 1 Answer

The amount that remains unchanged is 2.5 g.

#### Explanation:

The half-life of tritium is 12.32 years.

The formula for calculating the amount remaining after a number of half-lives,

#color(blue)(bar(ul(|color(white)(a/a)A = A_0/2^ncolor(white)(a/a)|)))" "#

where