What is the mass percent (m/m) of glucose in a solution that contains 25 g of wa

Question

What is the mass percent (m/m) of glucose in a solution that contains 25 g of water and 4.2 g of glucose? a. 16-8% b. 17% c. 14.4% d.85.6% How many milliliters of ethanol are needed to prepare 250 mL of a 3.5% (v/v) solution? Ad increase in which of the following will result in an increase in the solubility of oxygen water? a. Partial pressure of oxygen over the solution b. Temperature c. Total pressure over the solution by the addition of helium d. Volume of water Consider the following pressure graph for water. What will be the boiling point of water if the atmospheric pressure is 720 mmHg? Which of the following would you expect to be a Bronsted-Lowry acid? a. Fe^3+ b. H_2CrO_4 c. NH_3 d. NO^-_3 18. When dissolved in enough water to make 1.0 liter of solution, which of the following solutes yields the solution with the highest osmolarity? a. 0.10 mole of CaCl_2 b. 0.15 mole of NaCl c. 0.15 mole of AlCl_3 d. 0.40 mole of glucose

Explanation / Answer

Q13.

mass % = mass of glucose /( toal mass) * 100%

substitute data

mass % = 4.25 /(25+4.2) * 100%

mass = 14.554%

choose C

Q14.

mL of ethanol for solution

% = vol / total V * !00%

3.5% = vol / 250 * 100%

vol = 250*0.035 = 8.75 mL

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