Which of the following has highest mass?

Options

A. 1 gram atom of iron
B. 5 moles of `N_(2)`
C. `10^(24)` carbon atoms
D. 44.8 lit of He at STP

Answer

B

Explanation

One gram atom of iron = 56 g
5 moles of `N_(2)=5xx28=140g`
`10^(24)` carbon atoms `=(10^(24)xx12)/(6.023xx10^(23))g~=20g`
44:8 litres of He at STP = 8g