Question

What mass of Sn is formed by the complete reaction of 1.75 mol H₂ with excess SnO₂?

SnO_{2 +} 2H₂ --> Sn + 2H₂O

Answer 1

The reaction is

                                   SnO₂    + 2H₂   -->   Sn     +    2H₂O

Number of moles: 1 mol     2 mol       1 mol         2 mol

From the above reaction,

2 mol of H2 produces Sn = 1 mol

1.75 mol of H2 produces Sn = 1.75/2 mol = 0.875 mol

Mass of Sn = 118.71 g/mol

Mass of Sn produced = 0.875 x 118.71 g = 103.871 g