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Moles of solute in a given mass of solvent from elevation of boiling point

The same question, asked 2 times: 22 Apr 2025 S1*, 25 Apr 2025 S2. Every wording below, oldest first.

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  1. Question 1

    22 Apr 2025 S1

    73
    Calculate the number of moles of nonvolatile solute dissolved in 0.3 kg solvent if ΔTb=0.3 K\Delta T_{b}= 0.3\text{ }K and KbK_{b} for solvent is 1.8 K kg mol−11.8\text{ }K\text{ }kg{\text{ }mol}^{- 1}.

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  2. Question 2

    25 Apr 2025 S2

    67
    Calculate the number of moles of nonvolatile solute dissolved in 0.5 kg solvent if molal elevation constant for solvent is 2 kg K mol−1[ΔTb=0.8 K]2\text{ }kg\text{ }K{\text{ }mol}^{- 1}\left\lbrack \Delta T_{b}= 0.8\text{ }K \right\rbrack

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