Question

_____H2 + _____O2  _____H2O
How many grams of water will you make from 7 moles of H2?

Answer 1

126 g of H₂O

Step-by-step explanation:

Firstly, we complete the equation:

2H₂ + O₂ → 2H₂O

If we have 7 moles of hydrogen, we assume, the oxygen is in excess.

Ratio is 2:2.

2 moles of hydrogen can produce 2 moles of water

Then, 7 moles of H₂ must produce 7 moles of water.

We convert moles to mass → 7 mol . 18 g/mol = 126 g