tolong bantu ya pliss no 7 dan 8

7)
n C2H2 = V / 22,4 L/mol = 5,6 L / 22,4 L/mol = 0,25 mol

∆Hc = -2372,4 kJ / 2 = - 1186,2 kJ/mol

Q = ∆Hc × n = - 1186,2 kJ/mol × 0,25 mol = - 296,55 kJ

Bernilai negatif berarti kalor dibebaskan

Jawaban : E

8)
∆Hf HBr = ( - 72 kJ ) : 2 = - 36 kJ/mol
∆H penguraian HBr = - ( -36 kJ/mol ) = + 36 kJ/mol

n = V / 22,4 = 11,2 L / 22,4 = 0,5 mol

Q = ∆H × n = (+36 kJ/mol) × 0,5 mol = +18 kJ

Jawaban : B