A1.225 g sample mixture of lithium hydrogen carbonate is decomposed by heating to produce 0.660 g lithium carbonate. calculate the theoretical yield and percent yield of li2co3

The theoretical yield of lithium carbonate = 0.6659 g.The percent yield = 99.11%.

Explanation:

Lithium hydrogen carbonate is decomposed by heating according to:

2LiHCO₃(s) → Li₂CO₃(s) + H₂CO₃(g).

It is clear that 2.0 moles of lithium hydrogen carbonate produce 1.0 mole of lithium carbonate.

We need to calculate the no. of moles of (1.225 g) lithium hydrogen carbonate decomposed:

no. of moles of lithium hydrogen carbonate = mass/molar mass = (1.225 g)/(67.96 g/mol) = 0.018 mol.

0.02 mol of lithium hydrogen carbonate is decomposed to produce (0.02 mo /2 = 0.009 mol) of lithium carbonate.

∴ The theoretical yield of lithium carbonate = no. of moles x molar mass = (0.009 mol)(73.89 g/mol) = 0.6659 g.

∵ The percent yield = (actual yield/theoretical yield) x 100 = (0.660 g / 0.6659 g) x 100 = 99.11%.

The angle of reflection is 30°

D. h2o + h2o > h3o + oh- confirmed.