62) What is the mass percent of hydrogen in water? A) 33.3 B) 88.8 C) 5.60 D) 11.2 E) none of the above Answer: D 63) What is the mass percent of chlorine in hydrochloric acid? A) 2.8 B) 35.5 C) 97.2 D) 70.1 E) none of the above Answer: C 82) How many moles of oxygen are in 3.70 moles of NaClO 4? A) 3.70 B) 0.270 C) 21.5 D) 14.8 E) none of the above Answer: D 83) What is the mass percent of Mg in MgCl2? A) 12.3 B) 40.7 C) 25.6 D) 68.3 E) none of the above Answer: C 85) Given that sodium chloride is 39.0% sodium by mass, how many grams of sodium chloride are needed to have 750. mg of Na present? A) 1.92 B) 0.293 C) 1,920 D) 29.3 E) none of the above Answer: A 47) We dissolve 2.45 g of sugar in 200.0 g water. What is the mass percent of sugar in the solution? A) 1.21% B) 1.23% C) 2.42% D) 123% E) none of the above Answer: A 48) A solution contains 100.0 g water, 10.0 g NaCl, and 15.0 g methanol. What is the weight percent of methanol in the solution? A) 8.00% B) 10.0% C) 12.0% D) 15.0% E) none of the above Answer: A 53) How many moles of NaF are in 34.2 grams of a 45.5% by mass NaF solution? A) 0.814 B) 75.2 C) 15.6 D) 0.371 E) none of the above Answer: D 54) What is the molarity of a solution prepared by dissolving 10.7 g NaI in 0.250 L? A) 42.8 B) 0.0714 C) 2.86 x 10-4 D) 0.286 E) none of the above Answer: D 57) A 90.0 g sample of NaOH is dissolved in water and the solution is diluted to give a final volume of 3.00 liters. The molarity of the final solution is: A) 0.500 M B) 0.750 M C) 1.00 M D) 2.25 M E) none of the bove Answer: B 62) What is the final concentration of a solution prepared by diluting 35.0 mL of 12.0 M HCl to a final volume of 1.20 L? A) 0.504 M B) 3.50 M C) 0.420 M D) 0.350 M E) none of the above Answer: D 63) What volume of 12.0 M HCl is required to make 75.0 mL of 3.50 M HCl? A) 21.9 mL B) 0.560 mL C) 257 mL D) 560. mL E) none of the above Answer: A This project is funded by a grant awarded under the President’s Community Based Job Training Grant as implemented by the U.S. Department of Labor’s Employment and Training Administration (CB-15-162-06-60). NCC is an equal opportunity employer and does not discriminate on the following basis: against any individual in the United States, on the basis of race, color, religion, sex, national origin, age disability, political affiliation or belief; and against any beneficiary of programs financially assisted under Title I of the Workforce Investment Act of 1998 (WIA), on the basis of the beneficiary’s citizenship/status as a lawfully admitted immigrant authorized to work in the United States, or his or her participation in any WIA Title I-financially assisted program or activity. This product was funded by a grant awarded under the President’s High Growth Job Training Initiative, as implemented by the U.S. Department of Labor’s Employment & Training Administration. The information contained in this product was created by a grantee organization and does not necessarily reflect the official position of the U.S. Department of Labor. All references to nongovernmental companies or organizations, their services, products, or resources are offered for informational purposes and should not be construed as an endorsement by the Department of Labor. This product is copyrighted by the institution that created it and is intended for individual organizational, non-commercial use only.