Question

number of moles in 200g O?

Answer 1

We know that the molecular mass of CaCO3 can be calculated as per information:-

Ca--> 40u, C-->12, O-->16.

Hence molecular mass of CaCO3= 40+12+{3×(16)}=100u~~ 100g.

Here (given mass )=200g.

Now no. Of moles(n) = given mass ÷( molecular mass).

n=200÷100= 2 mols.

Answer 2

HEY MATE HERE IS YOUR ANSWER

● the molecular mass of oxygen = 16g

and HERE the measure of oxygen =200g

so the number of moles

200/16

= 12.5. moles