THe question is : Given the reaction CH3OH goes to CO + 2H2 Change in heat=90.7 a)endothermic or exothermic? b)Calculate amount of heat transferred when 45 g. of CH3OH id decomposed by this reaction at constant pressure. c)For a given sample of CH3OH the enthalpy change on reaction is 18.5kJ. How many grams of hydrogen gas are produced? d)What is the value of delta H for the reverse of the previous reaction? How many kJ of heat are released when 27 g of CO reacts completely with H2 to form CH3OH at constant pressure? I can do a and b. I am stuck on c and d. I know for c I need to determine the amount of moles of CH3OH involved in the reaction but am stumped at how to do that. Same with d. I think I need to determine the amount of CO moles then multipy by the heat involved per mole of the CO from the given reaction. Can't seem to be able to do it though. I know what needs to be done but can't do it!