Help me answer these 3 question thank you..

50. A student designed a calorimetry experiment to find the molar enthalpy of combustion of methanol, CH3OH(I). The student burned 0.0345mol of methanol to heat 0.100kg of water in the calorimeter and assumed that all the energy was transferred to the water. The initial and final thermometer readings, in degrees Celsius, are shown below. The student's experimental value for the molar enthalpy of combustion of methanol, expressed in scientific notation, is MJ/mol (express your answer with 3sig digs) 15. An oxidation-reduction reaction that occurs in the human body is * A. H2CO3(aq)CO2(g)+H2O(l) B. CH4(g)+2O2(g)CO2(g)+2H2O(g) C. C12H22O11(s)+12O2(g)12CO2(g)+11H2O(g) D. C6H12O6(aq)+6O2(aq)6CO2(aq)+6H2O(l) A B C D 24. Use the information below to answer the question. * In the equation Au3+(aq)+3NO2(g)+3H2O(l)Au(s)+3NO3(aq)+6H(aq)+, the oxidizing agent is A. NO2(g) B. H(aq)+ C. NO3(aq) D. Au3+(aq) A B C D