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Question

convert

1. 1.29 x 10^24 atoms of HF to grams

2. 3.14g of H2O to molecules

3. 2.79g NH3 to atoms

4. 4.90 mol Al2O3 to grams. To atoms

5. 3.56g of Cu to atoms

6. Mass of a sample of NO2 with 1.54 x 10^24 atoms.

7. How many molecules in a sample of NaClO with a mass of 3.90g.

8. 2.4g of CO2 would have how many Oxygen atoms.

9.63 x 10^22 molecules of CH3COONa to grams

10. 3.6g AlPO4 to moles

11. 2.4g Na2SO4 to molecules

12. 5.50 x 10^22 atoms CaSO4 to grams

13. 6.8g (NH4)3PO4 to moles

Answer 1

1. 1.29 x 10^24 atoms of HF to grams

Is this really atoms of HF or molecules of HF? There are 2 atoms per molecule of HF.

Assume atoms, then we have 6.45 x 10^23 molecules of HF.

The atomic weight of HF is 20 g/mole.

(6.45 x 10^23 molecules)(1 mole/6.02 x 10^23 molecules)(20 g/mole) = 21.4 g

If you want more answers, I am available for a lesson.

Carl