A 2.50 L sample of methane was collected over water at 28 °C until the pressure in the flask was 775 torr. A small amount of CaSO 4 ( s ) was then added to the flask to absorb the water vapor (forming CaSO 4 -2H 2 O ( s ) ). What is the pressure inside the flask once all the water is absorbed? Assume that the addition of CaSO 4 ( s ) absorbed all the water and did not change the volume of the flask. How many moles of CH 4 ( g ) have been collected?
A 2.50 L sample of methane was collected over water at 28 °C until the pressure in the flask was 775 torr. A small amount of CaSO 4 ( s ) was then added to the flask to absorb the water vapor (forming CaSO 4 -2H 2 O ( s ) ). What is the pressure inside the flask once all the water is absorbed? Assume that the addition of CaSO 4 ( s ) absorbed all the water and did not change the volume of the flask. How many moles of CH 4 ( g ) have been collected?
A 2.50 L sample of methane was collected over water at
28 °C
until the pressure in the flask was 775 torr. A small amount of
CaSO
4
(
s
)
was then added to the flask to absorb the water vapor (forming
CaSO
4
-2H
2
O
(
s
)
). What is the pressure inside the flask once all the water is absorbed? Assume that the addition of
CaSO
4
(
s
)
absorbed all the water and did not change the volume of the flask. How many moles of
CH
4
(
g
)
have been collected?
2H2S(g)+3O2(g)→2SO2(g)+2H2O(g)
A 1.2mol sample of H2S(g) is combined with excess O2(g), and the reaction goes to completion.
Question
Which of the following predicts the theoretical yield of SO2(g) from the reaction?
Responses
1.2 g
Answer A: 1.2 grams
A
41 g
Answer B: 41 grams
B
77 g
Answer C: 77 grams
C
154 g
Answer D: 154 grams
D
Part VII. Below are the 'HNMR, 13 C-NMR, COSY 2D- NMR, and HSQC 2D-NMR (similar with HETCOR but axes are reversed) spectra of an
organic compound with molecular formula C6H1003 - Assign chemical shift values to the H and c atoms of the
compound. Find the structure. Show complete solutions.
Predicted 1H NMR Spectrum
4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1
f1 (ppm)
Predicted 13C NMR Spectrum
100
f1 (ppm)
30
220 210 200 190 180
170
160 150 140 130 120
110
90
80
70
-26
60
50
40
46
30
20
115
10
1.0 0.9 0.8
0
-10
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