Which one of the following is the lightest?

Options

A. 0.2 mole of hydrogen gas
B. `6.023xx10^(22)` molecules of nitrogen
C. 0.1 g of silver
D. 0.1 mole of oxygen gas

Answer

C

Explanation

(a) Moles = given wt./molecular wt.
Weight of `H_(2)=` moles `xx` molecular wt.
`=0.2xx2=0.4 g`
(b) `6.023xx10^(23)` represents 1 mole
Thus `6.023xx10^(22)` will represent 0.1 mole
Wight of `N_(2)=0.1xx28=2.8=2.8 g`
(c) Weight of silver `=0.1 g`
(d) Weight of oxygen `=32xx0.1=3.2 g`
(e) Weight of water `=1 g`
Thus, 0.1 g silver is the lightest.