Question 17 of 254.0/ 4.0 Points`Suppose you need to obtain 1.33 moles of sodium fluoride. All you have available is a 23.4% bymass solution of it. How many grams of this solution would you need?
A. none of theseB. 31.1 gC. 55.9 g

D. 239 gE. 13.1 g
Feedback:Great! Mass percent is discussed in 6.4.
Question 18 of 250.0/ 4.0 PointsIf I need to dissolve 25.0 g of compound A in 50.0 mL of water, what is the mass % of my solution? Density of water = 1.00 g/mL
Feedback:Mass percent is discussed in 6.4.

Question 19 of 254.0/ 4.0 PointsIF you have 25.0 mL of a 6.50M NaOH solution and you add 10.0 mL of water to it, what is the new concentration?
Feedback:Great! Dilutions are discussed in 6.3.
Question 20 of 254.0/ 4.0 Points`If you have a solution of CaCl2with a concentration of 0.30 M, what does it contain?

Feedback:Great! Molarity is discussed in 6.3.
Question 21 of 254.0/ 4.0 Points'If I use 0.0395 kg of water to dissolve 0.0189 kg of salt, what is the mass percent of this solution?
A. 58.4%

B. 47.8%C. 32.4%D. The identity of the compound must be known.
Feedback:Great! Mass percent is discussed in 6.4.

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