Question

What are the number of moles of nitrogen in 274 grams of (NH4)2Ce(NO3)6?

(a) 16

(b) 8

(c) 6

(d) 4

Answer 1

Right choice is (d) 4

The explanation is: Molecular Weight of (NH4)2Ce(NO3)6 = 548 grams, => moles of (NH4)2Ce(NO3)6 = 274/548 = 0.5, => number of moles of nitrogen = 0.5*8 = 4.