The radioactive element americium-241 has a half-life of 432 years. Suppose we start with a 25-g mass of americium-241.
How much will be left after 263 years? Compute the answer to three significant digits.

Question

across · Answer

This is a chemistry question. :P

anonymous · Answer

This is exponential decay.

anonymous · Answer

Plug into the formula:

25 / 2^(283/432)

= B. 15.9 g

anonymous · Answer

this answer isnt in one of my options : i have a 15.2g, 16.4g, 20.8g, and 8.0 g

anonymous · Answer

my mistake, i put 283 instead of 263 in the formula, so it should be 16.4g