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# Blackboard chalk is a mixture of limestone and gypsum.A piece of blackboard chalk weighing 5.42g was immersed in HCl,the CO2 produced weighed 1.11g.What is the percentage of limestone in the chalk?Thank you

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Oct 18, 2017

46,5%

#### Explanation:

You must write the balanced reaction: $C a C {O}_{3} + 2 H C l = C a C {l}_{2} + {H}_{2} O + C {O}_{2}$
That means that from 1 mol of $C a C {O}_{3}$ whose MM is 100 g/mol you obtain 1 mol of $C {O}_{2}$ whose MM is 44 g/mol . making the proportion You have $g C a C {O}_{3} = 1 , 11 \times \frac{100}{44} = 2.52 g$
To found the % we have
%CaCO_3= (gCaCO_3) /(g sample.) xx 100 = 2.52/5.42 xx 100 = 46.5%

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