How would you calculate the maximum number of grams of CaCl2 that could be produced from 74g of Ca(OH)2 in the following reaction: 2HCl + Ca(OH)2 --> 2H2O + CaCl2?

1 Answer
Trevor Ryan.
Dec 9, 2015

#111g#

Explanation:

First calculate the number of moles of calcium hydroxide in the 74 grams :
#n=m/(M_r)=74/(40+32+2)=1mol#

Therefore, providing sufficient hydrochloric acid is added, the maximum amount of calcium calcium chloride that can be formed is also 1 mole (in order to satisfy the mole ratio in the balanced chemical reaction).

But 1 mole of calcium chloride corresponds to a mass of

#m=nxxM_r=1xx(40+2xx35,5)=111g#

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