Hydrogen gas, H2\text{H}_2H2, can be manufactured industrially by reacting methane with steam:
CH4(g)+H2O(g)→CO(g)+3H2(g) \text{CH}_4\text{(g)} + \text{H}_2\text{O(g)} \rightarrow \text{CO(g)} + 3\text{H}_2\text{(g)} CH4(g)+H2O(g)→CO(g)+3H2(g)Carbon monoxide, CO\text{CO}CO, is a waste product of this reaction.
Relative formula masses (MrM_rMr):
What is the atom economy for the production of hydrogen gas in this process?
Use the equation:
atom economy=total Mr of desired producttotal Mr of all reactants×100 \text{atom economy} = \frac{\text{total } M_r \text{ of desired product}}{\text{total } M_r \text{ of all reactants}} \times 100 atom economy=total Mr of all reactantstotal Mr of desired product×1005.9%5.9\%5.9%
17.6%17.6\%17.6%
20.0%20.0\%20.0%
82.4%82.4\%82.4%