Q = mCΔT
ΔT = 29.2 - 20 = 9.2 °C
Q = 120 x 4.184 x 9.2
Q = 4,619.1 Joules
It has bent geometry, which is similar to H2O, with the same angle of 109.5 degrees between 2 single H-S bonds.
Answer: m = 24.31 g/mol · 1.13 mol
Explanation: 2 mol HCl use 1 mol Mg.
Magnesium is used 0.5 · 2.26 mol = 1.13 mol
M(Mg) = 24.31 g/ mol