Question

Cat cantaresc - 5 moli de acid sulfhidric
- 3 moli oxid de calciu
- 4 moli fosfit de magneziu

Answer 1

∨ = m/M, m= ∨ x M
1. M( H2S)= (2 x1)+32 =34 g/mol
    m = 5 mol x 34 g/mol = 170 g (H2S)
2. M(CaO)= 40 +16 =56g/mol, m= 3mol x 56g/mol= 168 g
3. M( Mg3 (PO3)2 = (24x3) +(2 x 31) + (6x16) = 230g/mol, m= 4mol x 230 g/mol = 920 g