Neco Model Questions Vol1 2025 Chemistry Question 6

Practice essay / theory question 6 from the 2025 Neco Model Questions Vol1 Chemistry examination. This question covers States of Matter, Colligative Properties .

Neco Model Questions Vol1 2025 Chemistry Essay / Theory

Topics: States of Matter Colligative Properties

Question 6 NECO_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • essay

A 250.0 g sample of a non‑volatile solute (molar mass = 58.44 g mol⁻¹) is dissolved in 500.0 g of water. The solution is heated at 1 atm until it boils, and the observed boiling point is 102.5 °C.

Question Parts

( a )

Calculate the molality of the solution.

( b )

Using the ebullioscopic constant of water (K_b = 0.512 °C kg mol⁻¹), calculate the expected elevation in boiling point (ΔT_b) and the predicted boiling point of the solution.

( c )

Compare the calculated boiling‑point elevation with the observed boiling point (102.5 °C). Suggest two plausible reasons for the discrepancy.

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About This Question

This is Neco Model Questions Vol1 2025 Chemistry Question 6. It is one of the essay questions from the 2025 Neco Model Questions Vol1 Chemistry examination.

The question covers States of Matter, Colligative Properties .

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