Question

In the combustion of 200 g of the molecule drawn below, how many grams of oxygen are consumed? 

Answer 1

First we write the chemical equation

2C₆H₈O₆+O₂ $\to$ 2C₆H₆O₆+2H₂O

$(2×176.12)g\space Ascorbic\space acid \equiv32g \space Oxygen$

200g Ascorbic acid $\equiv$ x grams of oxygen.

X=$\frac{200}{352.24}×32=18.169g$