ANSWERS: 1
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First step: calculate the molecular weight (MW) of potassium sulfide Go to the periodic table and find the MW of each element present. K: 39.0983 g/mol S: 32.066 g/mol Now add up the MW for each element 2(39.0983 g/mol) + 32.066 g/mol = 110.26 g/mol Now that you have the total MW for the molecule you will multiply the # of moles you have of the molecule by this to get the # grams (3.3 moles)( 110.26 g/mol) = 363.9 g With correct significant figures: 3.6 x 10^2 g of K2S
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