Which of the statements is not true; (A) The solubility of a gas is directly pro

Question

Which of the statements is not true; (A) The solubility of a gas is directly proportional to its partial pressure. (B) The solubility of a solid is affected by pressure. (C) The solubility of a gas is directly proportional to its partial pressure is Henry's law. (D) The solubility of a gas in a liquid increases as the pressure increases. Calculate the Mass Percent of a Solution Containing 27.5 g of Ethanol in 175 mL H_2O. (A)15.7 (B) 78 (C) 30 (D) 13.6 What is the mass of solid sodium chloride needed to prepare 250 mL of 0.20 M NaCl? (A)2.9 g (B) 58.44 g (C) 250 g (D) 23 g Determine the Molarity of the sodium ions in a 0.150 M Na_3PO_4(aq) Solution. (A)0.150 M (B) 0.6 M (C) 0.450 (D) 0.0 M.

Explanation / Answer

17) B) is the answer as the solubility of solids aren't on the pressure change.

18) % mass = (27.5 g / 27.5+175 )*100 = 13.6 %

19) Mass of NaCl = (number of mols)(M.Wt) = (0.20 mol/L)(0.250 L)(58.5) = 2.9 g

20) Molarity of soldium ions = (number of Na+)(Molarity) = (3)(0.150) = 0.450 M

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