Author Question: Pure benzene, C6H6, freezes at 5.5 and boils at 80.1C. What is the boiling point of a solution ... (Read 159 times)

ddddddddddeeee4444 · **on:** Nov 5, 2023

Question 1

Oxygen gas makes up 21 % of the atmosphere by volume. What is the solubility of O₂(g) in water at 25°C if the atmospheric pressure is 741 mmHg? The Henry's law constant for oxygen gas at 25°C is 1.3 × 10^–3 mol/L·atm.
◦ 2.7 × 10^–4 M
◦ 1.3 × 10^–3 M
◦ 6.2 × 10^–3 M
◦ 9.6 × 10^–3 M
◦ 0.96 M

Question 2

Pure benzene, C₆H₆, freezes at 5.5° and boils at 80.1°C. What is the boiling point of a solution consisting of cyclohexane (C₆H₁₂) dissolved in benzene if the freezing point of this solution is 0.0°C? (For benzene, K_f = 5.12 °C/m, K_b = 2.53 °C/m; for cyclohexane, K_f = 20.0 °C/m, K_b = 2.79°C/m)
◦ 77.4°C
◦ 80.9°C
◦ 82.8°C
◦ 83.1°C
◦ 91.2°C

bball_babe_123 · **Reply #1 on:** Nov 5, 2023

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