Molar Mass

What is Molar Mass The SUM of the atomic masses of the atomic species as given in the molecular formula. 2 x 35.45 g= 70.90 g/ mole Cl2 Cl2 Atomic mass from periodic table (Rounded to nearest hundredth)

Example 1: Molar Mass of H2O Given is H2O Step 1: H: 2 x 1.01= 2.02 g/mol O: 1 x 16.00 = 16.00 g/mol Step 2: Add 2.02 g/mol + 16.00 g/mol= All answers MUST be rounded to nearest hundredth!! ANSWER 18.02 g/mol H2O

Example2: Molar Mass of Calcium Hydroxide Given is Calcium Hydroxide = Ca(OH)2 Step 1: Ca: 1 x 40.08= 40.08 g/ mol O: 2 x 16.00 = 32.00 g/mol H: 2 x 1.01 = 2.02 g/mol Step 2: Add 40.08 + 32.00 + 2.02 = All answers MUST be rounded to nearest hundredth!! ANSWER 74.10 g/mol Ca(OH)2

Practice: Find the molar mass for each of the following All answers MUST be rounded to nearest hundredth!! 1.) Sodium Hydroxide: NaOH 2.) Magnesium Chloride: MgCl2 3.) Cu(NO3)2 4.) HNO3 5.) Carbon Dioxide: For # 5 you must provide the formula to calculate the molar mass