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1. What is the mass of 1.38×1024atoms of magnesium ? 2. How many magnesium atoms are...

1. What is the mass of 1.38×1024atoms of magnesium ?

2. How many magnesium atoms are there in 28.6 grams of magnesium ?

3. What is the mass of 1.69×1023atoms of lead ?

4. How many lead atoms are there in 28.8 grams of lead ?

5. How many moles of Ga are there in a sample that contains 10.9 grams of gallium?

6. How many grams of gallium are there in a sample that contains 2.19 mol of Ga?

7. How many grams of magnesium cyanide, are present in 3.66 moles of this compound?

8. How many moles of magnesium cyanide are present in 2.15 grams of this compound?

9. How many moles of phosphorus trichloride, are present in 2.17 grams of this compound?

10. How many grams of phosphorus trichloride are present in 1.04 moles of this compound?

11. How many grams of cobalt(II) chromate, are present in 2.12 moles of this compound?

12.How many moles of cobalt(II) chromate are present in 1.38 grams of this compound?

(please explain how to do each one I need all the help I can get)

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