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

Answer 1

Hello, Sashauna,

Was the chemical reaction provided? I'll assume it is the combination of N₂ and H₂ to make NH₃. We need a balanced equation to start.

I come up with:

N₂ + 3H₂ = 2NH_{3 (}

We can now see that we need 3 moles of hydrogen for every 1 mole of nitrogen. Let's calculate how many moles of N₂ we have in 2.80 grams of the substance. The molar mass of N₂ is 28.0 g/mole. So we have (2.80 g/28.0 g/mole) or 0.100 moles N₂ The amount of H₂ needs to be three times the moles of N₂, which is 0.300 moles H₂. Convert this to grams by multiplying by the molar mass of H₂ (2.00 g/mole) to arrive at 0.6 grams of H₂.

Bob