Question

if you didn't answer correct , then I will report it, please don't say this
The equivalent weight of Ca in CaCO3 is
a)100
b)40
c)20
d)60
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Answer 1

Well your question is a bit unclear . Calcium makes up 40% of Calcium Carbonate . It's atomic mass is around 40 u . Therefore , I suggest Option b is correct .

Answer 2

${CaCO}^{3}$

1Ca atom molar mass= 40

1C atom molar mass = 12

1Oxygen atom molar mass = 16

Total = 40+12+16×3 =100

%Ca= 10040×100

=40%

The equivalent weight of Ca in CaCO3 is 40

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