If the heat effect of the reaction is 3924 kJ, then to obtain 11772 kJ of heat, cyclohexane is burned.

1. Let’s write the equation
C6H12 + 9O2 = 6CO2 + 6H2O + 3924 kJ
2. Let’s make the proportion.
For combustion of 1 mol (determined by the coefficient before cyclohexane) 3924 kJ is required.
To burn x mol, 11772 kJ is required.
3924x = 11772
X = 3 mol.
3. Find the mass of cyclohexane (I hope this is what you need to find)
m = nM, M = 12 * 6 + 12 * 1 = 84, m = 84 g / mol * 3 mol = 252 g
Answer: 252 g