CH301 F22


Composition Stoichiometry Extra Practice


Part 1 – Mass, Moles, and Molecules
  1. Calculate the number of moles in a 78.25 g sample of NaCl.
  2. Calculate the mass of 1.84 moles of MgCl2.
  3. Calculate the number of moles in a 0.153 g sample of H2SO3.
  4. Calculate the mass of 0.0194 moles of neon gas.
  5. Calculate the number of molecules in the neon gas sample above.
  6. Calculate the number of hydrogen atoms in 18.64 g water (H2O).

Part 2 – Percent Composition

Calculate the percent mass of every element in each of the following compounds:

  1. KClO4
  2. Na2Cr2O7
  3. CuSO4 · 5H2O
  4. MgF2
  5. H2O2
  6. CH2(NH2)2