Question 1) It was important that the flask be completely dry before the unknown

Question

Question 1)

It was important that the flask be completely dry before the unknown liquid was added so that water present would not vaporize when the flask was heated. A typical single drop of liquid water has a volume of approximately 0.05mL. Assuming the density of water is 1.0g/mL, if 6 drops of water were left in the flask how many moles of water would this be? ** Write answer in decimal form to four decimal places.**

Question 2)

Using your answer for question 1, what volume(in mL) would this amount of water occupy when vaporized at 100oC and 1atm?

** Write answer in decimal fom to one decimal place. **

Explanation / Answer

Q 1 )

6 drops volume = 6 x 0.05 = 0.30 ml

density of water = 1 g/ml

mass of water = 0.30 x 1 = 0.30 g

moles of water = mass of water / molar mass

                         = 0.30 / 18

                         = 0.0167

Q 2)

n = 0.0167

P = 1atm

T = 273 + 100 = 373 K

P V = n RT

1 x V = 0.0167 x 0.0821 x 373

V = 0.5114 Litre

V = 511.4 ml

volume = 511.4 ml

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