Calculate the mass of the following is grams (a) 5.4 moles of `O_(2)` (b) 2.5 moles of `CO_(2)`, ( c) `4.2` mole of nitrogen atoms.

Explanation

Mass = No.of moles x molecular mass
(a) Mass of 5.4 mole of `O_(2) = 5.4 xx 32 = 172.8`
(b) Mass of 2.5 mole of `C_(2) = 2.5 xx 44 = 110`
( c) Mass of 4.2 moles of nitrogen atoms = `4.2 xx 14 = 58.8`