115k views
14 votes
What is the mass of NaCl required to make 160 grams of a 12% solution of NaCl in water?

18 grams
19 grams
22 grams
24 grams

2 Answers

3 votes

Answer:

Second Option: 19 grams

Step-by-step explanation:

Total solution weight: 160 grams

percent of NaCl in the solution: 12%

You take these two numbers and multiply them with 12 being over 100:

160 *
(12)/(100) = 19.2 grams

and then just round to the nearest whole number: 19 grams

User Norilyn
by
7.9k points
8 votes

Answer: 19 grams

Step-by-step explanation:

percent by mass = (mass of part)/(mass of whole) * 100

this means that in this question, 12 = x/160 * 100, where x is the amount of NaCl.

this means 12/100 = x/160, and thus x = (160)(12/100)=19.2 grams

The closest option is B.

User Anazimok
by
7.5k points

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