Question

the number of moles of ammonia that have the same mass as that of 3 moles of carbon dioxide is

Answer 1

Let n be the number of moles of ammonia.

n(14+3)=3×(12+16×2)

Answer 2

1 mole of co2 weighs 12+16×3= 44 g
therefore 3 moles weigh 44×3=132g
accordingly,
17 g of ammonia is 1 moles
1 g of ammonia is 1/17 moles
132 g of ammonia is 132×1/17=7.76 moles
Hope it helps