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chemistry stoichiometry practice problems with answers n gas reacts with excess oxygen according to the reaction: \[ 2H_2 + O_2 \rightarrow 2H_2O \] Solution: Step 1: Write the molar masses: \( H_2 \): 2.02 g/mol \( H_2O \): 18.02 g/mol Step 2: Convert known mass of \( H_2 \) to moles: \[ \text{moles of } H_2 = \frac{10.0 \text{ g}}{2.0 R Rodolfo Romaguera Nov 10, 2025
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