What is the concentration, in mass percent, of a solution that contains 20.0 grams of NaCl dissolved in 250.0 grams of water? A. 6.76% B. 7.41% C. 8.00% D. 8.25%
10 items multiple choice
20. What is the concentration, in mass percent, of a solution that contains 20.0 grams of NaCl dissolved in 250.0 grams of water?
A. 6.76% B. 7.41% C. 8.00% D. 8.25%
21. Which of the following statements is TRUE for an unsaturated solution?
A. Undissolved solute must be present. C. The solubility limit for solute has been reached. B. No undissolved solute may be present. D. Solid crystallizes out if the solution is stirred.
22. For which of the following solutions is the concentration 1.0 molar?
A. 0.050 mol of solute in 25 mL solution C. 3.0 mol of solute in 1.5 L solution B. 2.0 mol of solute in 500 mL solution D. 0.50 mol of solute in 500 mL solution
23. Which is the measure of the mole of solute dissolved in a liter of solution?
A. molality B. molarity C. normality D. mole fraction
24. What is the osmotic pressure is exerted by a 1.82 M solution at 18ᵒC?
A. 43.48 atm B. 2.69 atm C. 1.0 atm D. 0.49 atm
25. It is the temperature at which a solution’s vapor pressure equals the external atmospheric pressure. A. melting point B. boiling point C. freezing point D. sublimation point
26. “The entropy of the universe increases in a spontaneous process and remains unchanged in an equilibrium process.” Is also known as __________ Law of
A. Zeroth B. First C. Second D. Third
27. It is the measure of how spread out or dispersed the energy of a system is among the different possible ways that system can contain energy.
A. reaction constant B. reaction rate C. entropy D. enthalpy
28. The __________ Law of Thermodynamics states that the entropy of a perfect crystalline substance is zero at 0 K.
A. Zeroth B. First C. Second D. Third
29. Reactions that absorb heat energy are collectively referred to as
A. spontaneous B. endothermic C. exothermic D. equilibria
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