Which one of the following is the lightest?

Options

A. 0.2 mole of hydrogen gas
B. `6.02 xx 10 ^(22)` molecules of nitrogen
C. 0.1 g of silver
D. 0.1 mole of oxygen gas

Answer

C

Explanation

Weitht of `H _(2) = ` mole `xx` molecular wt `, 0.2 xx 2 xx 0. 4 g`
`6. 02 xx 10 ^(23) = 1 ` mole , Thus, `6. 02 xx 10 ^(22) = 0.1` mole
Weight of `N _(2) = 0.1 xx 28 = 2. 8 g ,` Weight of oxygen `= 32 xx 0.1 = 3.2 g`