Strontium-90 has a half-life of 28.8 years. How much strontium-90 was present initially, if after 144 years 10.0 g remain

Question

Quizplus · Accepted Answer

Since the half-life of strontium-90 is 28.8 years, the amount of strontium-90 left after 144 years would be 1/2^5 = 1/32 of the initial amount. Let x be the initial amount of strontium-90. Then we can set up the equation:

10.0 g = x/32

Multiplying both sides by 32, we get:

320 g = x

Therefore, the initial amount of strontium-90 was 320 g, so the best choice is C).

Strontium-90 Has a Half-Life of 28