MASS AND THE MOLE

Mass to mole conversions and Mole to mass conversions

The conversion factor for both types of problems is the molar mass of the substance.

Ex: The molar mass of NaCl is 58.5g/mol so 58.5 g = 1 mol of NaCl

Solve the following on a separate piece of paper: Show all work and put a box around your answer! If it is messy and/or I cannot tell what you have done, you will NOT get credit!!

  1. What is the mass in g of 0.125 moles of Copper (II) chloride
  2. Find the number of moles of 225g of chlorine gas
  3. What is the mass in g of 0.0025 moles of Au
  4. What is the mass in kg of 3.333 moles of FeCl3
  5. Find the number of moles of 9.99g of copper
  6. Find the number of moles of 125g of magnesium
  7. Find the number of moles of 47g of water
  8. What is the mass in cg of 2.55 moles of dihydrogen monoxide
  9. What is the mass in mg of 6.2 moles of carbon dioxide
  10. Find the number of moles of 12.7g of nitrogen dioxide
  11. What is the mass in micrograms of 5.25 moles of C6H12O6
  12. Find the number of moles of 90.4g of hydrochloric acid

PARTICLES AND THE MOLE

Moles to particles and particles to moles

Particles can be atoms, molecules, or formula units.

The conversion factor for these problems is 1 mole = 6.02 x 1023 particles

Solve the following on a separate piece of paper: Show all work and put a box around your answer! If it is messy and/or I cannot tell what you have done, you will NOT get credit!!

Label the type of particle!!

  1. How many particles in 2.55 moles of water
  2. Find the number of moles of 5.22 x 1023 atoms of krypton
  3. Find the number of moles of 6.23 x 1012 molecules of fluorine
  4. How many particles in 6.2 moles of carbon monoxide
  5. How many particles in 0.25 moles of sodium chloride
  6. Find the number of moles of 1.25 x 1032 atoms of gold
  7. Find the number of moles of 2.22 x 1029 formula units of sodium hydroxide
  8. How many particles in 5.25 moles of sulfuric acid
  9. How many particles in 0.125 moles of copper (II) chloride
  10. Find the number of moles of 4.57 x 1059 formula units of magnesium chloride
  11. Find the number of moles of 3.54 x 1022 atoms of magnesium
  12. Find the number of moles of 7.22 x 10 12 molecules of water

VOLUME OF GASES AND THE MOLE

Moles to volume and volume to moles

The conversion factor for these problems is 1 mole of gas at STP = 22.4 L.

Solve the following on a separate piece of paper: Show all work and put a box around your answer! If it is messy and/or I cannot tell what you have done, you will NOT get credit!!

  1. Find the number of moles of 23.8 L of helium gas.
  2. Find the volume in liters of 6.2 moles of carbon dioxide
  3. Find the volume in centiliters of 5.25 moles of chlorine gas.
  4. Find the number of moles of 12.5 L of krypton gas
  5. Find the volume in milliliters of 111 moles of methane (CH4)
  6. Find the number of moles in 125 cL of nitrogen gas.
  7. Find the number of moles in 530 mL of oxygen gas.
  8. Find the number of moles in 65.7 L of radon gas
  9. Find the volume in mL of 126 moles of ammonia (NH3)
  10. Find the volume in cLof 3.33 moles of neon gas.

Complete the following table for acetone, C3H6O, being sure to show your work below the table

Number of
grams of C3H6O / Number of moles
of C3H6O / Number of
molecules C3H6O / Number of carbon atoms in C3H6O
0.0880
0.00500
1.00 x 109
1.00 x 1020