Mole Practice 1. Calculate the molar mass of C2H4Cl2. 2. Determine the percent composition of a. NaC2H3O2 b. Ca(NO3)2 3. Find the number of moles contained in 25.0 g of Sr(OH)2. 4. What is the mass of 4.00 moles of MgO? 5. How many moles are contained in 18.00 grams of NF3? 6. Which of the following is not equal to the others? a. 1 mol F2 b. 19.00 grams of F2 c. 6.02 x 1023 molecules of F2 d. Avogadro’s number e. 1 atom of F2 7. Which of the following has the greatest mass in one mole? a. Ammonia gas, NH3 b. Oxygen gas, O2 c. Xenon gas, Xe d. Chlorine gas, Cl2 8. How many moles of nitrogen, N2 are present in a 1.00 gram sample? 9. Which of the following is equal to 1.00 moles of the substance? a. 26.9 g of aluminum, Al b. 32.01 g of methane, CH4 c. 96 g of sugar, C6H12O6 d. 35.45 g of chlorine, Cl2 10. Apartame is an artificial sweetener that is 160 times sweeter than sugar when dissolved in water. It is marketed as Nutra-sweet. The formula of aspartame is C14H18N2O5. a. Calculate the molar mass of aspartame. b. How many moles of molecules are present in 10.0 g of aspartame? c. Calculate the mass in grams of 1.56 moles of aspartame. d. Calculate the percent composition of aspartame.