What mass of arsenic (As)in grams contains the same number of atoms as 39.95 g of argon (Ar)?
A)33.0
B)74.92
C)4.16
D)149.84

Question

Quizplus · Accepted Answer

The molar mass of argon is 39.95 g/mol, so 39.95 g of argon contains 1 mole of atoms. The molar mass of arsenic is 74.92 g/mol, so 74.92 g of arsenic also contains 1 mole of atoms. Therefore, 74.92 g of arsenic contains the same number of atoms as 39.95 g of argon.

What Mass of Arsenic (As)in Grams Contains the Same Number