A compound containing only hydrogen and carbon is burned in excess O2(g) to produce a total mass of 3.855 g of water and carbon dioxide. 1.215 g of that mass is H2O. What is the molecular formula of the unknown compound if 0.3 moles of it has a mass of 34.243g? You may assume 100% yield for the reaction. A. C8H18 B. C4H9 C. CH2.25 D. C18H8 E. C9H4 F. C2.25H G. CxHy

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A compound containing only hydrogen and carbon is burned in excess O2(g) to produce a total mass of 3.855 g of water and carbon dioxide. 1.215 g of that mass is H2O. What is the molecular formula of the unknown compound if 0.3 moles of it has a mass of 34.243g? You may assume 100% yield for the reaction.

A. C8H18
B. C4H9
C. CH2.25
D. C18H8
E. C9H4
F. C2.25H
G. CxHy
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