# molar mass practice

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Molar Mass Conversion Problems

Given this balanced equation, solve the following problem.

2Na + Cl2 --------> 2NaCl

How much Cl2 is required to make 232 grams of NaCl?

Step 1: Find out how many moles are in 232 grams of NaCl. (Hint: Use molar mass of
NaCl.)

Step 2: Using dimensional analysis or a proportion, convert from moles of NaCl to moles
of Cl2. (Hint: Use the balanced equation’s coefficients.)

Step 3: Convert moles of Cl2 to grams of Cl2. (Use molar mass of Cl2.)
Balance the following equation and then solve the problem.

CH4 + O2 --------------> CO2 + H2O

How much CH4 is required to produce 72 grams of H2O?

Step 1: Find out how many moles are in 72 grams of H2O. (Hint: Use molar mass of
H2O.)

Step 2: Using dimensional analysis or a proportion, convert from moles of H2O to moles
of CH4. (Hint: Use the balanced equation’s coefficients.)

Step 3: Convert moles of CH4 to grams of CH4. (Use molar mass of CH4.)
Find out how many moles are in the following amounts of the given compounds (Hint:
Use molar masses):

168 grams of CaO

248 grams of H2CO3

280 grams of KOH

320 grams of CuO

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