Question

How many grams of Na2 O are produced when 2.70 moles Na react?

Answer 1

Reaction:

4Na + O₂ → 2Na₂O

Proportion:

4 – 2

2.70 mol – x mol

x = 1.35 mol of Na₂O

M(Na₂O) = 61.97 g/mol

$m = n\times M$

$m = 1.35 \;mol \times 61.97\; g/mol = 83.66\; g$

Answer: 83.66 g