1) 7.269 moles of oxygen gas are used in combusting butane (C H..). How many moles of carbon dioxide gas are produced? You must start with a balanced chemical equation. Start with a balanced equation

Explanation:

C4H10 + 13/2O2 > 4CO2 + 5H2O

so u can work out the amount of moles by doing

moles=mass/mr

mr of C4H10 is 12 × 4 + 10 =58

=7.269/58

= 0.125moles

Then u can use the molar ratio which is

6.5:4

0.125 ÷6.5 × 4 = 0.0769moles

hope this helps:)

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i think   the answer is c hope i'm right