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When 2.4g of carbon reacted with X g of ...

When 2.4g of carbon reacted with X g of oxygen to form `CO and CO_2, 50.4 kJ `of heat was released and no reactant is left over. Standard heats of formation of carbon monoxide and carbondioxide are `-110.5 kJ mol^(-1) and -393.5 kJ mol^(-1)` respectively. Calculate X. 

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`4.8g`
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