![]() ![]() To solve this problem we need to recall that 1 mol isequal to 6.02 x 10 23. Sample #5: Calculate the number of moles in 1.95 x 10 22 atomsof Ne. From above recall that 1 molcontains 6.02 x 10 23 atoms, molecules or formulaunits. We can also calculate moles from numbers ofatoms, molecules or formula units. It is the same conversion factor as used in Sample 2above, just inverted.Įxtra problems to try, Calculate the number of grams in a) 10.4 mol Mo b) 4.69 x 10 -1 mol Na 2SO 4 c) 24.9 mol N 2O 4 Sample #4: Calculate the number of grams in 0.0492 moles of H 2SO 4.To solve this problem we must invert the factor we use forconversion. Itis the same conversion factor as used in Sample 1 above, justinverted. To solvethis problem we must invert the factor we use for conversion. Sample #3: Calculate the number of grams in 1.95 moles of He. We can also convert from moles back to grams ofa substance. ![]() Now we can use the ratio to convert the mass ofsulfuric acid given to moles using the setup Įxtra problems to try, Calculate the number of moles in a) 0.457 grams Mo b) 1.95 x 10 2 grams Na 2SO 4 c) 35 grams N 2O 4 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. ![]() The number of grams of KClO3 will be 306.Today we disccussed the mol in more detail.
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