Methanol is an efficient fuel that can be produced from coal and hydrogen. `CH_(2)OH(g) + ((3)/(2))O_(2)(g) to CO_(2)(g) + 2H_(2) O(l) " " DeltaH = - 764 kJ`
(a) Find the heat evolved when 110 g of methanol is burnt in excess of oxygen.
(b) Calculate the mass of oxygen consumed to produce 975 kJ of heat.

Explanation

Molecular mass of `CH_(3)OH = 32 g`
(a) Hint : 32 g of `CH_(3)` OH gives 764 k J of heat
Answer : `2626.2 k J ` of heat .
(b) Hint : `16xx3` g of oxygen given 764 kJ of heat .
Answer : 61.26 g of oxygen .