Covalent compounds: N2, CCl4, SiO2 and AlCl3.
Ionic compounds: CaCl2 and LiBr.
Hope this helps!
Adding the number of protons by the number of neutrons
1 mol of Br = 79.9 g
15.7 g / 79.9 g = 0.196 moles of atoms
Given teh equation adn the heat of reaction, reaction 2's heat of reaction can be obtained by simply multiplying teh heat of reaction of 1 by 3. The final answer is -6129 kJ.
