Use dimensional analysis and include units.

1. How many formula units of silver fluoride, AgF, are equal to 42.15g of this substance?

2. What is the mass of 8.83 x 10^23 formula units of Iron (III) oxide, Fe2O3?

3. How many formula units are equal to a 0.25g sample of chromium (III) sulfate, Cr2(SO4)3?

4. How many molecules are in a 189g sample of carbon tetrabromide, CBr4?

(The numbers are subscripts.)​