When a gaseous compound X containing only C, H, and O
is burned in O2, 1 volume of the unknown gas reacts with
3 volumes of O2 to give 2 volumes of CO2 and 3 volumes
of gaseous H2O. Assume all volumes are measured at the
same temperature and pressure.
(d) Combustion of 5.000 g of X releases 144.2 kJ heat.
Look up ΔH°f values for CO21g2 and H2O1g2 in
Appendix B, and calculate ΔH°f for compound X.
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