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Question

# How many grams of water can be formed when 4.0 grams of hydrogen are ignited with 4.0 grams of oxygen?

A
0.50
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B
2.5
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C
4.5
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D
8.0
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E
36
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Solution

## The correct option is C 4.52H2+O2→2H2O The molar masses of hydrogen, oxygen and water are 2 g/mol, 32 g/mol and 18 g/mol respectively.The number of moles is the ratio of mass to molar mass.The number of moles of hydrogen =4.0g2g/mol=2.0mol The number of moles of oxygen =4.0g32g/mol=0.125 moles0.125 moles of oxygen will react with 0.125×2=0.250 moles of hydrogen.However, 2.0 moles of hydrogen are present.Hence, hydrogen is present in excess and oxygen is the limiting reagent.0.125 moles of oxygen will give 2×0.125=0.250 moles of water.Mass of water formed =0.250mol×18g/mol=4.5g

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