Answer:
14.93 g
Explanation:
First we convert 1.2 x 10²³ atoms of arsenic (As) into moles, using Avogadro's number:
- 1.2 x 10²³ atoms ÷ 6.023x10²³ atoms/mol = 0.199 mol As
Then we can calculate the mass of 0.199 moles of arsenic, using its molar mass:
- 0.199 mol * 74.92 g/mol = 14.93 g
Thus, 1.2x10²³ atoms of arsenic weigh 14.93 grams.
