According to the thermochemical level C2H4 + 3O2 is equal to 2 Co 2 + 2 H O + 1400 kJ, calculate the amount

According to the thermochemical level C2H4 + 3O2 is equal to 2 Co 2 + 2 H O + 1400 kJ, calculate the amount of heat released during the combustion of 0.5 mol of ethylene C2 H4

Given:
n (C2H4) = 0.5 mol

Find:
Q1 -?

Solution:
1) C2H4 + 3O2 => 2CO2 + 2H2O + 1400 kJ;
2) 1 mol C2H4 – 1400 kJ;
0.5 mol C2H4 – (x) kJ;
x = 0.5 * 1400/1 = 700;
Q1 = x = 700 kJ.

Answer: The amount of heat is 700 kJ.