Question

The half-life of barium-131 is 12.0 days. How many grams of

Answer 1

Let's see

$\\ \rm\Rrightarrow A=A_o(0.5)^{\frac{t}{H}}$

• H is half-life

$\\ \rm\Rrightarrow A=10(0.5)^{\frac{60}{12}}$

$\\ \rm\Rrightarrow A=10(0.5)^5$

$\\ \rm\Rrightarrow A=10(0.03125)$

$\\ \rm\Rrightarrow A=0.3125g$