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26. Mass of sugar = 100 g

27. a).m/m % = 8.67 %

     b).m/m% = 20%

28.a). Mass of sugar = 12.5 g

     b).Mass of sugar = 12.5 g

     c).Mass of sugar = 30 g

Explanation:

26. Use formula:

m/m = 20%

mass of solution = 500 g

mass of Solute = mass of sugar = ?

insert in the formula,

mass of solute = 100 g

27. a)

mass of Barium hydroxide(solute) = 13 g

mass of solution = 150 g

m/m % = 8.67 %

b).

mass of Glucose (solute) = 50 g

mass of solution = 250 g

m/m% = 20%

28. a)

m/m% = 5

mass of solution = 250 g

mass of solute = ?

mass of sugar = 12.5 g

b).

m/m% = 2.5%

mass of solution = 500 g

mass of solute = ?

mass of sugar = 12.5 g

c).

m/m% = 3 %

mass of solution = 1 kg = 1000 g

mass of solute = ?

Mass of sugar = 30 g