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5g of hydrogen = 5 / Mr(H2) = 5 / 2 = 2.5 mol of hydrogen

8g of oxygen = 8 / Mr(O2) = 8 / 16 = 0.5 mol of oxygen

Due to formula of water being H2O it is seen that the reaction is limited by the amount of oxygen. Therefore only 0.5 mol of water can be produced.

0.5 mol of water = 0.5 * Mr(H2O) = 0.5 * 18 = 9 grams.

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