Chemistry College Pre Nursing Class

Question

Nnitrogen gas reacts with hydrogen gas to produce ammonia. (3)

N2(g) +3H2 (g) --- 2NH3(g)

Hnow many grams of H2 are needed to react with 2.80g of N2?

0.61g H2

0.60gH2

0.605g H2

0.604 g H2

Answer 1

Your balanced equation ion identifies your molar ratios in the problem. For every mole of N₂, you need 3 moles of H₂ for a complete reaction. Calculate the number of moles 2.80g represents, triple it, and convert it back to grams of H₂.

28g of N₂ is a mole.

2.8/28 = 0.1 mol of N₂

2g of H₂ is a mole. 0.3 moles of H₂ is needed for the reaction.

2*0.3=0.60g H₂ necessary for the reaction.