A Tiny Speck (2

Multiple Choice

A tiny speck (2.0  10^-4 g) of radioactive Americium-241 (241.06 g/mol) is used in smoke detectors. How many atoms of Americium-241 are there in one of these smoke detectors?

A) 5.0  10¹⁷ atoms
B) 1.2  10²⁰ atoms
C) 2.9  10²² atoms
D) 6.0  10²³ atoms
E) 8.3  10⁷ atoms