Calculating reacting masses is calculating the ratio of reactants and products in a reaction. It is important industrially to ensure no valuable reactant is wasted or unused, otherwise the process will not be as profitable.
E.g. Calculating the maximum mass of Methanol that can be produced from 14g of Carbon monoxide:
Step 1: Balanced equation - CO + 2H2 --> CH3OH
STEP 2: calculate Mr of products and reactants:
CO = 28g CH3OH = 32g
*we go from 28 to 32, to calculate how we divide 32 by 28 = 1.14 and multiply 1.14 by 14g (produced from 14g of Carbon monoxide)
Step 3:
28g of CO --> 32g of CH3OH .... so .... 14g of CO ---> 16g of CH3OH
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