Question

1. How many moles of Cs are there in a sample that contains 3.17×10²²cesium atoms?

2. How many cesium atoms are there in a sample that contains 3.69 mol of Cs?

3. How many moles of Kr are there in a sample that contains 3.23×10²²krypton atoms?

4. How many krypton atoms are there in a sample that contains 1.14 mol of Kr?

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

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

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

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

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

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

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

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

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

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

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

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

Answer 1

As per HomeworkLib T&C we have to answer the first 4 subparts from many subparts.

1. (3.17×10²² Cs atoms)/(6.022×10²³ atoms/mole)

=0.05264 moles

2. (3.69 mol of Cs)×(6.022×10²³ atoms/mol)

=2.222×10²⁴ atoms

3. (3.23×10²² Kr atoms)/(6.022×10²³ atoms/mole)

=0.053637 moles

4. (1.14 mol of Kr)×(6.022×10²³ atoms/mol)

=6.865×10^{23 atoms}

^{We believe you can answer all the rest questions in the same way as done above all the 16 questions are of similar type.}