Methanol, CH3OH, is an efficient fuel with a high octane rating that can be produced from coal and hydrogen. CH3OH(g) + 3 2 O2(g) → CO2(g) + 2H2O(l) ∆H = -764 kJ
a. Find the heat evolved when 90.0 g of CH3OH(g) burns in excess oxygen.
b. What mass of O2 is consumed when 945 kJ of heat is given out?

11. Calculate the amount of energy liberated when 3.5 mol of pentane are combusted. C5H12(l) + 8O2(g) → 5CO2(g) + 6H2O(l) ∆H = -23.11 kJ/g

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.