Question

10g of Na was made to react with 8g of H2O to form hydrogen gas. Identify the limiting reagent and calculate the mass of hydrogen formed

Answer 1

The molecular masses of hydrogen, oxygen and water are 2 g/mole, 32 g/mole and 18 g/mole respectively.2H 2 +O 2 →2H 2 O 2×2=4 g of hydrogen reacts with 1×32=32 g of oxygen to form 2×18=36 g of water.Hence, 44 =1 g of hydrogen reacts with 432 =8 g of oxygen to form 436 =9 g of water.9 grams of water can be produced when 8 g of hydrogen reacts with 8 g oxygen.

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