Calculate the mass in `g` of
(a) `2 "mole of" CO_(2)`
(b) `2N "molecules of" CO_(2)`

Explanation

(a) `:' 1` mole of `CO_(2)` has molecular mass `= 44`
`:' 2 ` mole of `CO_(2)` has molecule mass `=2xx44`
`= 88 g`
(b) `N` molecule of `CO_(2)` has molecular mass `=44`
`:' 2N` molecules of `CO_(2)` has molecule mass
`=44xx2= 88 g`