Practice Molality (1.2.7) - Solutions - CBSE 12 Chemistry Part 1

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6 sample questions

Question 1.
Define molality.
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Think about how solute and solvent quantities are related.
Question 2.
How would you convert grams of a solute to moles?
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Remember the formula: moles = mass/molar mass.
3Question 3.
What is molality?
- Moles of solute per liter of solution
- Moles of solute per kilogram of solvent
- Grams of solute per liter of solution
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Think about the unit of mass in the definition.
4Question 4.
True or False: Molality is influenced by temperature changes.
- True
- False
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Consider how temperature affects volume versus mass.
Question 5.
A chemist dissolves 15 g of NaCl in 200 g of water. Determine the molality of the solution and discuss its importance.
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Use the molar mass of NaCl (about 58.5 g/mol) to find moles.
Question 6.
A solution has a molality of 2.5 m when 100 grams of solute is added. Calculate the mass of the solvent in kg, and interpret why this value matters in boiling point elevation.
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Think about the colligative properties that change with more solute.

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