A student monitors the decomposition of hydrogen peroxide, H2O2\text{H}_2\text{O}_2H2O2, by measuring the mass loss of the flask as oxygen gas, O2\text{O}_2O2, escapes:
2H2O2(aq)→2H2O(l)+O2(g) 2\text{H}_2\text{O}_2(\text{aq}) \rightarrow 2\text{H}_2\text{O}(\text{l}) + \text{O}_2(\text{g}) 2H2O2(aq)→2H2O(l)+O2(g)During the first 2.0 minutes2.0\text{ minutes}2.0 minutes of the reaction, the mass of the flask decreases by 0.88 g.
What is the amount, in moles, of oxygen gas (O2\text{O}_2O2) that has escaped from the flask?
Relative atomic mass (ArA_{\text{r}}Ar): O=16.0\text{O} = 16.0O=16.0
0.0550 mol0.0550\text{ mol}0.0550 mol
0.0489 mol0.0489\text{ mol}0.0489 mol
0.0275 mol0.0275\text{ mol}0.0275 mol
0.0138 mol0.0138\text{ mol}0.0138 mol