C12 molality calculation

# C12 molality calculation - can use the density to find the...

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What is the molality (m) of concentrated HNO 3 ? The molarity is 15.9 M. The density of HNO 3 is 1.42 g/mL. Write the expression you need: m(HNO 3 ) = mol (HNO 3 ) kg (H 2 O) You are given the molarity – which gives you the moles of HNO 3 M(HNO 3 ) = 15.9 mol HNO 3 L(solution) We need to convert liters of solution in the denominator of Molarity to kg of water for molality. Convert L(solution) to kg (H 2 O) Think about it: g(solution) = g(H 2 O) + g(HNO 3 ) Grams of Solution : Assume you have 1 liter of solution. Then you

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Unformatted text preview: can use the density to find the total number of gm of solution. 1 L soln X 1000 mL soln X 1.42 g HNO3 = 1420 g of soln L soln 1 mL soln • Gm HNO 3 : Find the gm of HNO 3 by converting the mol of HNO 3 to gm of HNO 3 . g HNO 3 = 15.9 mol HNO 3 X 63.01 g HNO 3l = 1002 g HNO 3 1 mol HNO 3 g(solution) = g(H 2 O) + g(HNO 3 ) 1420 g 1002 g HNO 3 1420 g soln- 1002 g HNO 3 = 418 g water = 0.418 kg water m = __ 15.9mol HNO 3 = 38.0 m HNO 3 0.418 kg water...
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C12 molality calculation - can use the density to find the...

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