M (H2SO4) = 2 + 32 + 64 = 98 г/моль
ω (H) = 2 / 98 • 100% = 2%
ω (S) = 32 / 98 • 100% = 32,7%
ω (O) = 64 / 98 • 100% = 65,3%
M (Al2O3) = 54 + 48 = 102 г/моль
ω (Al) = 54 / 102 • 100% = 52,9%
ω (O) = 47,1%
M (H2S) = 2 + 32 = 34 г/моль
ω (H) = 2 / 34 • 100% = 5,9%
ω (S) = 32 / 34 • 100% = 94,1%