Aluminum metal reacts with chlorine producing a spectacular display of sparks: 2al(s) + 3 cl2(g) à 2alcl3(s) δho = -1408.4 kj how much heat is released when 7.5 g of metal react with excess chlorine

Answer is: -197,1 kJ heat is released in reaction.
Chemical reaction: 2Al + 3Cl₂ → 2AlCl₃ ΔH = -1408,4 kJ/mol.
m(Al) = 7,5 g.
n(Al) = m(Al) ÷ M(Al)
n(Al) = 7,5 g ÷ 27 g/mol
n(Al) = 0,28 mol.
0,28 mol : 2 mol = x : -1408,4 kJ/mol.
ΔH = -197,1 kJ.
n - amount of substance.

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