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Question

Carbon reacts with chlorine to form CCl4. 36 g of carbon was mixed with 142 g of Cl2. Calculate the mass of CCl4 produced and the remaining mass of reactant.

A
W(CCl4)=154 g, Wc=24 g
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B
W(CCl4)=156 g, Wc=24 g
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C
W(CCl4)=56 g, Wc=2 g
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D
W(CCl4)=26 g, Wc=54 g
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Solution

The correct option is A W(CCl4)=154 g, Wc=24 g
The balanced chemical reaction is C+2Cl2CCl4.
36 g of carbon will react with 3612×2×71=426 g of chlorine.
However, only 142 g of chlorine is present.
Thus, chlorine is the limiting reagent.
142 g of chlorine will produce 142×15471×2=154 g of carbon tetrachloride.
142 g (2 moles) of chlorine will react with 12 g (1 mole) of carbon.
The amount of carbon remaining unreacted after the reaction is 3612=24 g.

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