The formula mass is obtained by summing the atomic massesof the elements in the formula 2 H = 2 x 1.0 g = 2.0 g 1 S = 32.0 g = 32.0 g 4 O = 4 x 16.0 g = 64.0 g Total formula mass = 98 g We can use the identity 1 mol H 2SO 4 = 98 g H 2SO 4 to setup a ratio which will allow us to convertbetween grams and moles for sulfuric acid. The mass of 1 mol of H 2SO 4is the formula mass of H 2SO 4 expressed ingrams. Sample #2: Calculate the number of moles in 15 g of H 2SO 4.To solve this problem we must determine the mass, in grams, of 1mol of sulfuric acid. Now we can use the ratio to convert the mass ofhelium given.1.0 g to moles using the setup We can use the identity 1 mol He = 4.0 g He to setup a ratio which will allow us to convertbetween grams and moles for helium. To solve thisproblem we must determine the mass, in grams, of 1 mol of helium.The mass of 1 mol of helium is the atomic mass of heliumexpressed in grams. Sample #1: Calculate the number of moles in 1.0 g of He. If we are given a mass, or amount of a substance we candetermine the number of moles in the substance. 1 mol has a mass in grams equal to the atomic, formula or molar mass of a substance.1 mol of an atom, molecule or formula unit contains 6.02 x 10 23 atoms, molecules or formula units. ![]() Today we discussed the mol in more detail. Today we disccussed the mol in more detail.
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