Analyse data to determine percentage and theoretical yield. (Formula: percentage yield (%) = experimental yield theoretical yield × 100 1)

Ammonia is synthesised from nitrogen and hydrogen according to the equation \(\text{N}_2(g) + 3\text{H}_2(g) \rightarrow 2\text{NH}_3(g)\) Calculate the percentage yield when 4.0 mol of nitrogen and 15.0 mol of hydrogen react to produce 6.4 mol of ammonia.

Calcium carbonate decomposes when heated according to the equation: \[ \text{CaCO}_3(s) \rightarrow \text{CaO}(s) + \text{CO}_2(g) \] Calculate the percentage yield if 14.0 g of CaO is produced when 0.300 mol of CaCO₃ is heated.

A student performs the combustion of magnesium ribbon in air according to the equation: \[ 2\text{Mg}(s) + \text{O}_2(g) \rightarrow 2\text{MgO}(s) \] The student begins with \(1.20\) g of magnesium and collects \(1.75\) g of magnesium oxide. Analyse the data to determine: (a) the theoretical yield of magnesium oxide, in grams. (1 mark) (b) the percentage yield. (1 mark)