In a combustion reaction, initially there were #77.8g# of oxygen gas, and a #22.8g# mass of carbon; #18.0*g# of oxygen remained after the reaction. If the carbon were completely oxidized, what mass of carbon dioxide resulted?

Answer 1

Look at the conditions proposed by the reaction........

#77.8*g-18.0*g# oxygen gas reacted, and #22.8*g# carbon was consumed. Given complete combustion, CLEARLY, #(59.8+22.8)*g=82.6*g# #CO_2(g)# were produced.

Why #"CLEARLY?"#. Because mass is conserved in all chemical reactions. #"Garbage in must equal garbage out".# See this link.

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Answer 2

Owen Ambrose

The mass of carbon dioxide formed in the combustion reaction is 56.8 g.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

In a combustion reaction, initially there were #77.8*g# of oxygen gas, and a #22.8*g# mass of carbon; #18.0*g# of oxygen remained after the reaction. If the carbon were completely oxidized, what mass of carbon dioxide resulted?

In a combustion reaction, initially there were #77.8g# of oxygen gas, and a #22.8g# mass of carbon; #18.0*g# of oxygen remained after the reaction. If the carbon were completely oxidized, what mass of carbon dioxide resulted?