Question

3. What is the weight percentage of urea solution in which 10 g of urea is dissolved in 90 g water.

Answer 1

Explanation:

Weight of solution= 5+95=100g

∴ Mass of percentage of urea=

100

5

×100=5%

Answer 2

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Given :

▪ Weight of urea = 10g

▪ Weight of water = 90g

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To Find :

▪ Weight percentage of urea solution.

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Weight percentage :

✏ Symbol : %(w/W)

✏ Definition : Amount of solute in grams present in 100g of solution.

✏ Effect of temperature : No effect

✏ Formula :

%w/W = (Mass of solute × 100) ÷ (Total mass of solution)

๏ Solute = Urea

๏ Solvent = Water

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Calculation :

→ %w/W = 10×100/(10+90)

→ %w/W = 1000/100

→ %w/W = 10%

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