What are the steps needed to calculate the percent composition of Carbon in CH4

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

What must be in balance for temperatures to remain constant?

Which of these describes how heat is transferred by convection* a. sunlight travels through space without the aid of fluids or solids. b. warm air rises and takes the heat with it, eventually, it cools and sinks c. air at the equator rises and sinks at the poles. d. air molecules touch the warm ground, heating them up *not conduction