When a sample of sodium weighing 18.4 g of chlorine was burned, the reaction released 328.88 KJ of heat

When a sample of sodium weighing 18.4 g of chlorine was burned, the reaction released 328.88 KJ of heat. Based on these data, write the thermochemical equation for the combustion of sodium in chlorine.

Given:
m (Na) = 18.4 g
Q1 = 328.88 kJ

To find:
thermochemical equation -?

1) 2Na + Cl2 => 2NaCl;
2) n (Na) = m / M = 18.4 / 23 = 0.8 mol;
3) 0.8 mol Na – 328.88 kJ;
2 mol Na – Q kJ;
Q = 2 * 328.88 / 0.8 = 822.2 kJ;
4) 2Na + Cl2 => 2NaCl + 822.2 kJ.