A solution is made by mixing 90.0 g alcohol with enough water to a total m 250.

Question

A solution is made by mixing 90.0 g alcohol with enough water to a total m 250. g solution. What is the mass % concentration of the solute? A 150. g sample of a solution of salt in water is evaporated to dryness. Th the dry solid is 27.0 g. Calculate the mass % of the salt. The mass % concentration of a solution, made by dissolving 12.5 g of Ba(NO3)2 in enough water, is 25.0%. What is the mass of water in the solution? A sulfuric acid solution has a density of 1.49 g/ml and contains 59.0% H2SO4 by mass. What is the amount of H2SO4 that is present in 100.0 ml solution?

Explanation / Answer

2)

m = 90 g of Alcohol

mt = 250 g of solution

% solute = mass solute/total mass *100= 90/250 *100 = 36%

3)

150 g of salt

solid = 27 g

% mass in salt = mass of salt/ total mass *100% = 27/150 *100 = 18%

4)

m = 12.5 g of Ba(NO3)2

% = 25 mass

find mass of water...

% mass of solute = mass of solute /total mass * 100%

solve for total mass

25 = 12.5/ mass * 100

0.25 = 12.5/mass

mass = 12.5/0.25 = 50 g of solution

for water (solvent)

solution = solvent + solute

50 = 12.5 + solvent

water = 50-12.5 = 37.5 g of water

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