Calcium chloride, CaCl2\text{CaCl}_2CaCl2, can be prepared using a neutralisation reaction.
Methods 1 and 2 show two different ways of making calcium chloride.
Method 1 – Reaction of hydrochloric acid with calcium carbonate: 2HCl+CaCO3→CaCl2+H2O+CO22\text{HCl} + \text{CaCO}_3 \rightarrow \text{CaCl}_2 + \text{H}_2\text{O} + \text{CO}_22HCl+CaCO3→CaCl2+H2O+CO2
Method 2 – Reaction of hydrochloric acid with calcium oxide: 2HCl+CaO→CaCl2+H2O2\text{HCl} + \text{CaO} \rightarrow \text{CaCl}_2 + \text{H}_2\text{O}2HCl+CaO→CaCl2+H2O
A company wants to produce calcium chloride as sustainably as possible.
Use the idea of atom economy to help explain which method, 1 or 2, the company should use to make calcium chloride.
Relative atomic mass (ArA_rAr): Ca=40.1\text{Ca} = 40.1Ca=40.1, Cl=35.5\text{Cl} = 35.5Cl=35.5, H=1.0\text{H} = 1.0H=1.0, C=12.0\text{C} = 12.0C=12.0, O=16.0\text{O} = 16.0O=16.0