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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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Fipas Fipas
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11 years ago
Concentrated NaOH is 19.4 M and 50.5% NaOH by mass.

The answer choices are

a. 0.392 g/mL
b. 1.26 g/mL
c. 1.54 g/mL
d. 2.55 g/mL
e. 9.80 g/mL

Please explain how you got the answer too, thanks!
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wrote...
#1
11 years ago
19.4 mol/L * 40 g/mol = 776 g/L = 0.776 g/mL
50.5% NaOH
0.776g/mL / .505 = 1.54 g/mL
Answer accepted by topic starter
micro205micro205
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#2
Posts: 41
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11 years ago
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#3
11 years ago
Given:
50.5 g NaOH is dissolved in 100 g solution implies 50.5 g NaOH is associated with 49.5 g water

The strength of this solution is 19.4 M  or 19.4 moles/liter of solution

FW(NaOH) = 23 + 16 + 1 = 40

50.5 g NaOH = 50.5/40 =1.2625  moles  Let the volume of the solution be V L

Then 1.2625/V = 19.4  OR  V = 1.2625/19.4 = 0.0651 L OR 65.1 mL

The density is mass/volume = [50.5 g (NaOH)  + 49.5 g (H2O)]/65.1 = 100/65.1 = 1.536 ~ 1.54 g/mL or (c)
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