Question

How many moles of CaCO3 would weight 5g?
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Answer 1

ANSWER ::

Molecular mass of CaCO3 =sum of all the masses of its components

Molecular mass of CaCO3 =sum of all the masses of its componentsCa=40u

Molecular mass of CaCO3 =sum of all the masses of its componentsCa=40uO=16u

Molecular mass of CaCO3 =sum of all the masses of its componentsCa=40uO=16uC=12u

Molecular mass

=40+12+3x16

=40+12+3x16=40+12+48

=40+12+3x16=40+12+48=100u

Therefore

molar mass of CaCO3 is 100g

molar mass of CaCO3 is 100g100g of CaCO3 contains 1 mole.

SO

1g of CaCO3 contains 1/100 mole.

SO

5g of CaCO3 contains 5/100 Mole = 1/20 Mole

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Answer 2

500moles

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