Question

Assuming that the following reaction is performed at stp, how many ml of oxygen are needed to react with 50ml of h2 gas in synthesis of water
equation given 2H2+O2 = 2H2O

Answer 1

The balanced chemical reaction is written as:

2H2+O2 = 2H2O

We are given the amount of H2 gas to be used in the reaction. This will be used as the starting point for the calculations. We calculate as follows:

.050 L H2 ( 1 mol H2 / 22.4 L H2 ) ( 1 mol O2 / 2 mol H2 ) ( 22.4 L / 1 mol ) = 0.025 L O2 or 25 mL O2