Question

The thermochemical equation shows the combustion of carbon in oxygen. How many moles of carbon, C must be burnt to produce 196.5 kJ of heat?
C(s)+O2(g)--->CO2(g)ΔH=-393kJ mol-¹

Answer options:
a) 0.8 mol
b) 1.2 mol
c) 0.2 mol
d) 0.5 mol

Answer 1

Since 1 moll of carbon produce -393kJ/moll

x moll of carbon produce -196,5 kJ/moll

=>x= -196,5/-393= 0,5

Answer: D