020 INTRO TO CHEMISTRY ENHANCED 593939-8conline /11/18, 9:27 PM Question 7 (1 po

Question

020 INTRO TO CHEMISTRY ENHANCED 593939-8conline /11/18, 9:27 PM Question 7 (1 point) How many mL of a 4.60 M KOH solution are needed to make 500.0 mL of a 0.700 M solution? Your Answer: (o mL. Answer units Save Question 8 (1 point) is the concentration (in M) of a solution that was prepared by diluting 15.0 mL of a 0.700 M solution to a final volume of 150.0 mL? Your Answer: OM Answer units Save Question 9 (1 point) How many grams of NaCl are present in 138.5 g of a 21.6 % by mass sodium chloride solution? Your Answer: Mu ram units Answer Save broward.edwld2uilms/quizzing/userjatemps/quizac.impot-spg 18gj-8018165ai 7611827anb

Explanation / Answer

Answer. 7

M1V1 = M2V2

4.6 × V1 = 0.7 × 500

V1 = 76.08 mL

Answer 8.

M1V1 = M2V2

M1× 15 = 0.7 × 150

M1 = 7M

Answer 9.

21.6% by mass of NaCl solution

Mass of solution is given 138.5g

If mass of solution is 100 then mass of NaCl = 21.6g

mass of solution is 138.5 g then mass of NaCl =

( 21.6×138.5)/100=>29.9g

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