A hydrogen/oxygen fuel cell stack produces (100 mathrm{~kW}) of DC power at an efficiency of (60 %)

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A hydrogen/oxygen fuel cell stack produces \(100 \mathrm{~kW}\) of DC power at an efficiency of \(60 \%\) with water vapor as the product. Determine the hydrogen mass flow rate in \(\mathrm{g} / \mathrm{s}\) and the required cell voltage.

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