Chapter 5, Problem 101AP

A 4.117-g impure sample of glucose ${\text{(C}}_{\text{4}}{\text{H}}_{\text{12}}{\text{O}}_{\text{6}}\text{)}$ was burned in a constant-volume calorimeter having a heat capacity of $\text{19}\text{.65 kJ/°C}$. If the rise in temperature is $3.134°C$, calculate the percent by mass of the glucose in the sample. Assume that the impurities are unaffected by the combustion process and that $\Delta U=\Delta H$. See Appendix 2 for thermodynamic data.