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9. The mass reference used in molar mass values in the modern periodic table is based on the carbon-12 atom having a mass of exactly 12amu. This means one mol of C-12 atoms has a mass of exactly 12g. Show how to determine the molar mass of carbon shown in the periodic table if C12 atoms make up 98.90% of natural abundance carbon on Earth and C-13 atoms with mass 13.003355 amu make up 1.10% of natural carbon (C-14 atoms make up a negligible fraction of all carbon atoms on Earth). 10. The Orozco family grills every Saturday after their weekly football match with the Duran family. To grill they need a total of 531.26g of propane gas. How many atoms of carbon are present in that amount 11. A canal in Mexico City has 1.2071032 molecules of water. How many liters of water are in this canal? 12. A pool has a total of 4.2107 liters of water. How many grams of H2O are there in the pool? How many molecules of H2O are there in the pool? How many atoms of hydrogens are there