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D-5
ADVANCE STUDY ASSIGNMENT
1.
If 19.00 mL of 0.0824 M HSO3NH2 is used for one run in this experiment, what is the minimum
volume of 0.250 M NaNO2 that should be used to ensure that complete reaction occurs?Answer :
6.26 mL
2.
If an additional 4.0 mL of the NaNO2 solution is added to the HSO3NH2 of problem 1, what effect
will this have on the amount of N
2(g)
produced? Answer: The additional NaNO2 will not increase
the volume of N
2(g)
produced because HSO3NH2 is the limiting reagent. Excess NaNO2 merely
ensures that the moles of N
2(g)
formed equals moles of sulfamic acid that you start with.
3.
(a) What is the vapor pressure of water directly above a container of water at 22.3 °C?
Answer:
20.2 mm Hg (Use linear interpolation from the values given at 22 and
23 °C in the table of water vapor pressure on the Chemistry Data Sheet).
(b) Assume that, besides water, only N
2(g)
is present. If the atmospheric pressure is
705 mm Hg, what is the partial pressure of N
2(g)
?
Answer: 685 mm Hg
4.
If the column of water in a buret is 10.0 cm high, what is P
wc
(mm Hg) at room temperature?
(ie. ~22
C)
Answer: 7.37 mm Hg
