Question

Calculate the % by mass of (NH), SO, in a solution prepared by mixing 41.78 (NH.),so, with 525 mL H.O. sp. gr. H,0 = 1.00 Answer Calculate the % by mass of Ba(NO2), of a solution prepared by mixing 42.0 g of 25.09% Ba(NO), solution with 58.0 g of 40.8% Ba(NO), solution. Answer 3) Calculate the % by mass Sr(OH), M, N, m, mf H.O of a Sr(OH), solution that contains 107.23 Sr(OH), dissolved in enough H,O to make 3.000 L of solution. The density of the solution is 1.14 g/mL. % Sr(OH), = Σ Ζ Ε X HO = mf HẠO =

Answer 1

Percent by mass(or mass percent) is the mass of one component divided by the mass of the whole mixture, multiplied by 100

Massof substance 100 Masspercent Totalmassofmixture

To calculate the mass of water we use the formula,

Mass = Density * Volume (Relative density is also known as specific gravity)

Therefore mass of water = 525 ml * 1g/ml = 525 g

Total Mass= Mass of water + Mass of (NH4)2SO3 = 525 +41.7g = 566.7g

Mass percent of (NH4)2SO3 = Mass of (NH4)2SO3 / Total Mass

= 41.6/566.7 *100

= 7.34%

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