Which one of the following is the lightest?

Options

A. `0.2` mole of hydrogen gas
B. `6.02xx10^(22)` molecules of nitrogen
C. `0.1 g` of silver
D. `0.1` mole of oxygen gas

Answer

C

Explanation

Weight of `H_2`= mole `xx` molecular wt , `=0.2xx2=0.4 g`
`6.02xx10^(23)=1` mole, Thus `6.02xx10^(22)=0.1` mole
Weight of `N_(2)=0.1xx28=2.8 g` , Weight of silver `=0.1 g`,
Weight of oxygen `=32xx0.1=3.2 g`