1. Performing Stoichiometry Calculations Notes and Practice for ALMOST every possible calculation

2. Masses to moles Steps: 1) Determine molar mass of given substance 2) Divide amount given in problem by the molar mass you calculated. 1.How many moles does 80.0 grams of H 2 O represent? 2. How many moles does 45.0 grams of C 6 H 12 O 6 represent? 3.How many moles does 22.0 grams of CO 2 represent? 4.How many moles does 56.0 grams of N 2 represent?

3. Moles to mass Steps: 1) Calculate Molar Mass of given substance. 2) Multiply given number of moles by the molar mass you just calculated 1.What is the mass of 2.0 moles of LiOH ? 2.What is the mass of 5.0 moles of Ba(CN) 2 ? 3.What is the mass of 3.5 moles of water? 4.What is the mass of 0.75 moles of CuSO 4 ?

4. Moles to Particles Step 1) Multiply number of moles given by Avogadro's number (6.02 x 10 23 ) 1.How many atoms does 2.0 moles of He represent? 2.How many sodium ions are in 3.0 moles of NaCl? 3.How many molecules are in 0.25 moles of CH 4 ? 4.How many total atoms are in 1.0 moles of H 2 O ?

5. Particles to Moles Step 1) Divide number of particles given by Avogadro's number (6.02 x 10 23 ) 1.How many moles of water does 6.02 x 10 23 molecules represent? 2.Convert 3.01 x 10 23 molecules of C 2 H 6 to moles. 3.How many moles of glucose (C 6 H 12 O 6 ) does 1.2 x 10 24 molecules represent? 4. How many moles of CaCl 2 does 2.41 x 10 24 formula units represent?

6. Grams to Moles Grams of one substance to moles of another substance Pre-Solution Steps: 1) Balance the equation 2) Calculate the molar mass of the given substance 3) Determine the molar ratio between the substance given and the substance asked to find. (The Coefficients in the balanced equation.) Calculation Steps:1) Determine the number of moles of the given substance by dividing the mass given by the molar mass of the given substance 2) Convert moles of A to moles of B by multiplying the number of moles of substance A (given) by the molar ratio. 1) How many moles of NaCl will be produced if you start with 46 g of Na? Na + Cl 2 --> NaCl 2) How many moles of Na 2 SO 4 are produced if you start with 126 g of NaOH? NaOH + H 2 SO 4 --> H 2 O + Na 2 SO 4

7. Moles to Grams Moles of one substance to grams of another substance Pre-Solution Steps: 1) Balance the equation 2) Calculate the molar mass of the requested substance 3) Determine the molar ratio between the substance given and the substance asked to find Calculation Steps:1) Determine the number of requested moles by multiplying the number of moles of substance A (given) by the molar ratio. 2) Convert moles requested to grams by multiplying the number of requested moles but the molar mass you 1) How many grams of NaCl will be produced if you start with 4 moles of Na? Na + Cl 2 --> NaCl 2) How many grams of Na 2 SO 4 are produced if you start with 12 moles of NaOH? NaOH + H 2 SO 4 --> H 2 O + Na 2 SO 4

8. Grams to Grams Grams of one substance to grams of another substance Pre-Solution Steps: 1) Balance the equation 2) Calculate the molar mass of the given substance 3) Calculate the molar mass of the requested substance 4) Determine the molar ratio between the substance given and the substance asked to find Calculation Steps:1 &2) Same as Grams to Moles 3) Multiply the number of moles requested by the molar mass of the requested substance. 1) How many grams of NaCl will be produced if you start with 46 g of Na? Na + Cl 2 --> NaCl 2) How many grams of Na 2 SO 4 are produced if you start with 126 g of NaOH? NaOH + H 2 SO 4 --> H 2 O + Na 2 SO 4

9. Grams to Particles Grams of one substance to Particles of another Pre-Solution Steps: Same as Grams to Moles Calculation Steps:1 & 2) Same as Grams to Moles 3) Multiply the number of moles requested by Avogadro's number (6.02 x 10 23 ). 1) How many molecules of NaCl will be produced if you start with 46 grams of Na? Na + Cl 2 --> NaCl 2) How many molecules of Na 2 SO 4 are produced if you start with 126 grams of NaOH? NaOH + H 2 SO 4 --> H 2 O + Na 2 SO 4

10. Particles to Grams Particles of one substance to grams of another Pre-Solution Steps: Same as Moles to Grams Calculation Steps:1) Determine the number of moles of the given substance by dividing the particles given by Avogadro's number (6.02 x 10 23 ) 2&3) Same as Moles to Grams 1) How many grams of NaCl will be produced if you start with 3.01 x 10 23 atoms of Na? Na + Cl 2 --> NaCl 2) How many grams of Na 2 SO 4 are produced if you start with 3.04 x 10 24 molecules of NaOH? NaOH + H 2 SO 4 --> H 2 O + Na 2 SO 4