Author Question: An unknown compound is composed of 65.44% C, 29.07% O, and 5.49% H. A sample weighing 5.34 g, when ... (Read 19 times)

WhattoUnderstand · **on:** Jul 8, 2021

Question 1

An isotonic solution will produce an osmotic pressure of 7.84 atm measured against pure water at human body temperature (37.0 °C). How many grams of sodium chloride must be dissolved in a liter of water to produce an isotonic solution?
◦ 75.5 g
◦ 151 g
◦ 2.58 g
◦ 9.00 g
◦ 18.0 g

Question 2

An unknown compound is composed of 65.44% C, 29.07% O, and 5.49% H. A sample weighing 5.34 g, when dissolved in 60.00 g H₂O, lowers the freezing point to -0.600 °C. What is the molecular formula of the compound? (K_f for water = 1.86 °C/m; C = 12.0, O = 16.0, H = 1.0 g/mol).
◦ C₃H₃O
◦ CHO
◦ C₁₄H₁₁O₆
◦ C₅H₅O₅
◦ C₇H₅O₃

Beatricemm · **Reply #1 on:** Jul 8, 2021

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