Gram to Mole; Mole to Molecule, Molecule to Atom Conversions

 

1. How many nitrogen atoms are present in 45.91 grams of nitrogen gas, N2?

2. What is the mass of 6.73 x 1021 molecules of acetominophen, C8H9O2N?

3. A beaker contains 205 g sodium benzoate, NaC7H5O2. How many moles of NaC7H5O2 are present? How many molecules? How many hydrogen atoms?

4.  A sample of sodium carbonate contains 3.91 grams of sodium carbonate, Na2CO3.  How many moles of sodium carbonate are in the sample?

5.  A malachite bead, Cu2CO3(OH)2, contains 7.2 x 1018 atoms of copper.  What is the mass, in mg, of the bead?

6.  How many potassium atoms are contained in a 5.08 g sample of potassium acetate, KC2H3O2?

7.  How many total ions are present in 6.2 grams of ammonium carbonate, (NH4)2CO3?

8.  A weighing boat contains 14.82 g sucrose (C12H22O11).  How many moles of sucrose are in the sample?  How many carbon atoms are in this sample?

9.  The mineral orthoclase has the chemical formula, KAlSi3O8.  How many atoms of silicon are present in a 7 x 102 gram sample of orthoclase?

10.  How many chlorine atoms are present in 8.11 g of aluminum perchlorate, Al(ClO4)3?

11.  How many grams of gold(III) nitrate, Au(NO3)3, would contain 9.0 x 1027 atoms of gold?

12.  Emeralds have the chemical formula, Be3Al2Si6O18.  What mass of emerald (in mg) would contain 5.9 x 1018 beryllium atoms?

13.  How many grams of copper(II) acetate, Cu(C2H3O2)2, would contain the same number of copper atoms as 4.3 g of copper(I) phosphate, Cu3PO4?

14.  How many phosphorus atoms are present in a 38 mg piece of turquoise, CuAl6(PO4)4(OH)8?

15.  A sample of lead(IV) perchlorate, Pb(ClO4)4, has the mass of 0.0984 g.  How many moles of lead(IV) perchlorate are contained in the sample?  How many molecules?  How many chlorine atoms?

 

 

Below are the answers to the conversion problems on this page.

 

1. How many nitrogen atoms are present in 45.91 grams of nitrogen gas?

 

1.973 x 1024 nitrogen atoms

 

2. What is the mass of 6.73 x 1021 molecules of acetominophen, C8H9O2N?

 

1.69 g C8H9O2N

 

3. A beaker contains 205 g sodium benzoate, NaC7H5O2. How many moles of NaC7H5O2 are present? How many molecules? How many hydrogen atoms?

1.42 moles NaC7H5O2

8.57 x 1023 NaC7H5O2 molecules

4.28 x 1024 hydrogen atoms

4.  A sample of sodium carbonate contains 3.91 grams of sodium carbonate.  How many moles of sodium carbonate are in the sample?   0.0369 moles of sodium carbonate

5.  A malachite bead, Cu2CO3(OH)2, contains 7.2 x 1018 atoms of copper.  What is the mass, in mg, of the bead?          1.3 mg

6.  How many potassium atoms are contained in a 5.08 g sample of potassium acetate?     3.12 x 1022 potassium atoms

7.  How many total ions are present in 6.2 grams of ammonium carbonate?       1.4 x 1023 ions

8.  A weighing boat contains 14.82 g sucrose (C12H22O11).  How many moles of sucrose are in the sample?  How many carbon atoms are in this sample?                 

0.04329 moles & 3.127 x 1023 carbon atoms

9.  The mineral orthoclase has the chemical formula, KAlSi3O8.  How many atoms of silicon are present in a 7 x 102 gram sample of orthoclase?      5 x 1024 Si atoms

10.  How many chlorine atoms are present in 8.11 g of aluminum perchlorate?  4.50 x 1022 Cl atoms

11.  How many grams of gold(III) nitrate would contain 9.0 x 1027 atoms of gold?  5.7 x 106 g Au(NO3)3

12.  Emeralds have the chemical formula, Be3Al2Si6O18.  What mass of emerald (in mg) would contain    5.9 x 1018 beryllium atoms?        1.8 mg

13.  How many grams of copper(II) acetate would contain the same number of copper atoms as 4.3 g of copper(I) phosphate?                  8.2 g Cu(C2H3O2)2

14.  How many phosphorus atoms are present in a 38 mg piece of turquoise, CuAl6(PO4)4(OH)8?             1.2 x 1020 phosphorus atoms

15.  A sample of lead(IV) perchlorate has the mass of 0.0984 g.  How many moles of lead(IV) perchlorate are contained in the sample?  How many molecules?  How many chlorine atoms?      1.63 x 10-4 moles Pb(ClO4)4;               9.79 x 1019 molecules Pb(ClO4)4;              3.92 x 1020 chlorine atoms

 

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