Calculate ∆G, at 298 K and 760 torr for the reaction HgS(s) + 2 HCl(g) → HgCl2 + H2S(g)

if you start with 1.5 moles of red HgS and excess HCl. ∆G0f for HgS(s, red) is −50.6 kJ/mol, for HCl(g) is −95.30 kJ/mol, for HgCl2 is −179 kJ/mol, and for H2S(g) is −33.6 kJ/mol