'M' means Molarity = moles per litre
moles = Molarity x volume (in litres)
equation shows a 2:1 ratio of silver nitrate to calcium chloride
1. calculate the moles of 100 cm3 of 0.200 M AgNO3 = 0.02 moles
2. calculate the moles of 100cm3 of 0.500 M CaCl2 solution = 0.05 moles
from the equation 0.02 moles of AgNO3 would react with 0.02/2 moles of calcium chloride = 0.01 moles
Therefore THERE IS MORE THAN ENOUGH CALCIUM CHLORIDE - it is in excess and the limiting reagent is the silver nitrate.
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