Working out a product yield

Not only is using moles useful for writing the reaction recipe, but it can also be used to work out how much product we can expect from a reaction. In equation 4.3.1, 1 mole of calcium carbonate (100 g) mixed with 2 moles of hydrogen chloride (73 g) in water results in 1 mole of calcium chloride. This has a RFM of (40 + 71 = 111), so we could expect a yield of 111 g of calcium chloride. 

To convert between mass in grammes and moles we use the simple formula first seen in Unit 4.1 as equation 4.1.1  

to calculate the mass in grammes we could expect from a reaction, equation 4.1.1 is rearranged to  

In a reaction between magnesium carbonate and sufficient sulfuric acid, we start with 10 g of magnesium carbonate. How much magnesium sulfate will be produced  

As 1 mole of magnesium carbonate will give 1 mole of magnesium sulfate, then we can expect to get 0.119 moles of magnesium sulfate. 

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