Questions
Calculate the mass of urea (NH2CONH2) required in making 2.5 kg of 0.25 molal aqueous solution.
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By Expert Faculty of Sri Chaitanya
a
37 g
b
35 g
c
34 g
d
32 g
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Correct option is A
Mass of solvent = 1000 g Molar mass of urea (NH2CONH2) = 60 g mol-10.25 mole of urea = 0.25 x 60 = 15 gTotal mass of solution = (1000 + 15) g = 1.015 kg∵1.015 kg of solution contain urea = 15 g∴2.5kg of solution will contain urea =151.015×2.5=37 g
Similar Questions
Match the items of Column I with Column II.
| Column I (Concentrations term) | Column II (Factor on concentration term depends) | ||
| A. | Molarity | p. | Dependent upon temperature |
| B. | Molality | q. | Not depend upon volume |
| C. | Mass per cent | r. | Depend upon volume of solution |
| D. | Volume per cent | s. | Depend upon moles of solute |
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