Answer to Question #145067 in General Chemistry for Zander

Question

when nitrogen gas reacts with hydrogen gas,ammonia gas is formed.How many grams of hydrogen gas are required to react completely with 3,5 L of nitrogen at STP?

Answer 1

Solution:

A chemical equation must be balanced:

N₂ + 3H₂ = 2NH₃

According to the reaction equation for 3 mol of H₂ is needed 1 moles of N₂.

Therefore,

mass of H₂ = V of N₂ / 22,4L/mol × 3mol H₂ / 1mol N₂ × M of H₂ = 3.5L N₂/22.4L/mol × 3mol H₂/1mol N₂ ×2 g/mol H₂ = 0.9375 g H₂

Answer: mass of H₂ is 0.9375 g