(Solved): how much heat is released or absorbed. from the reaction A chemist carefully measures the amoun ...

A chemist carefully measures the amount of heat needed to raise the temperature of a $254.0\mathrm{mg}$ sample of ${\mathrm{C}}_6{\mathrm{H}}_7\mathrm{N}$ from 22.5 으 $\mathrm{C}$ to $39.4{}^{\circ }\mathrm{C}$. The experiment shows that $9.17\mathrm{J}$ of heat are needed. What can the chemist report for the molar heat capacity of ${\mathrm{C}}_6{\mathrm{H}}_7{\mathrm{N}}^2$ Round your answer to 3 significant digits. A chemist measures the energy change $\Delta H$ during the following reaction: $2{\mathrm{H}}_2\mathrm{O}(\mathrm{I})\to 2{\mathrm{H}}_2(g)+{\mathrm{O}}_2(g)\Delta H=572.\mathrm{kJ}$ Use the information to answer the following questions.