Moles to Mass & Mass to Moles!

In today's class we learned how to convert from moles to mass and mass to moles, which is an extension of what we learned last class.

Examples:

*How many moles of Oxygen gas are required to produce 9.8 mol of Carbon dioxide (decomposition)?

1. CO2--> C + O2

9.8 mol x 1/1= 9.8 mol

*When Magnesium chloride reacts with Potassium oxide to form Magnesium oxide and Potassium chloride, how many moles of Magnesium chloride are needed to produce 18.4 mol of Potassium chloride?

2. MgCL2 + K2O -> MgO + 2KCL

18.4 mol x 1/2 = 9.20 mol

In some cases you will be given a quantity that is in moles and the question will ask you to determine the mass.

*How many grams of Calcium chloride are needed to produce 8.34 mol of pure Calcium?

CaCl2-> Ca + Cl2

8.34mol x 1/1 x 111.1g/1mol= 926.574g or 927g

*How many grams of Calcium chloride are needed to produce 67.43 mol of pure Chloride?

67.43 mol x 1/1 x 111.1g/1 mol= 7491.473g or 7491g

 


 
Next class: Mass to Mass Conversions!