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 atoms in a speck of Americium-241 can be calculated using Avogadro's number.Number of atoms = (Mass of speck / Molar mass of Americium-241) * Avogadro's number= (2.0 * 10^-4 g / 241.06 g/mol) * 6.022 * 10^23 atoms/mol= 5.0 * 10^17 atomsTherefore, the correct answer is A.

A Tiny Speck (2