Question

Calculate the number of moles present in 25 g of CaCO3.

URGENT!!!

Answer 1

Thank you for asking the question!
In order to calculate the number of moles in 25 g of calcium carbonate following formula will be used. 
As the molecular weight of calcium carbonate = 40+12+3*16
                                                molecular weight = 100 g
weight of calcium carbonate given= 25 g.
moles of calcium = weight\molecular weight
                           = 25\100
                            = 0.25 moles.
thus number of moles in 25 g of calcium carbonate is 0.25.
Hope it helps.

Answer 2

Answer:

Molar mass=40+12+(16×3)

=100g/mole

Mole=mass/molar mass=25g/100g/mol e

1/4moles

=0.25 moles

Explanation: