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?

Question

Quizplus · Accepted Answer

The number of moles of americium-241 in the speck is:(2.0 * 10^-⁴ g) / (241.06 g/mol) = 8.3 * 10^-⁷ molThe number of atoms of americium-241 in the speck is:(8.3 * 10^-⁷ mol) * (6.022 * 10²³ atoms/mol) = 5.0 * 10¹⁷ atoms

A Tiny Speck (2