CHM 105 F17 HW 9 me Answer the Q\'s in the spaces below. Use the back page if ne

Question

CHM 105 F17 HW 9 me Answer the Q's in the spaces below. Use the back page if necessary. K. 39.1; N 14.0; Na 23.0; O 16.0; C 12.0 amu What is the mass/volume % of a solution made by dissolving 15.0 g of CaCl2 i water? 1 exactly 65.0 mL of 2 What is the mass mass % of a solution made by dissolving 8.0 g of dextrose in 50.0 g of water? 3. What is the molarity of a solution obtained by dissolving 7.350 g of KNO, in some water and diluting to exactly 100.0 mL in a graduated flask. 3. How many grams of Na COs are there in exactly 10.00 mL of a 0.1053 M solution of the salt? 4. What is the molarity of a solution made by diluting exactly 25.00 mL of a 0.2026 M solution of Nal to exactly 250 mL in a graduated flask?

Explanation / Answer

Ans 1) mass/volume % = [mass of solute (g) / volume of solution (mL)] x 100

therefore, mass/volume percentage in above case is = [15 g / 65 mL] x 100 = 23.0769 %

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