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Question
24 g of carbon reacts with some oxygen to make 88 grams of carbon dioxide. Find out how much oxygen must have been used.
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Solution
Given: Mass of carbon (reactant) = 24 g, mass of carbon dioxide (product) = 88 g
To find: Mass of oxygen (reactant)
Calculation: 12 g of carbon combines with 32 g of oxygen to form 44 g of carbon dioxide as follows:
\[\ce{\underset{12g}{Carbon} + \underset{32g}{Oxygen} -> \underset{44g}{Carbon dioxide}}\]
Hence, (2 × 12 = 24 g) of carbon will combine with (2 × 32 = 64 g) of oxygen to give (2 × 44 = 88 g) carbon dioxide.
Mass of oxygen used = 64 g
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