In one lab, thegas-collecting apparatus used a gas bulb with a volume of 257 mL. How many grams of CaCO 3 ( s ) need to be heated to prepare enough CO 2 ( g ) to fill this bulb to a pressure of 738 torr at a temperature of 23 °C ? The equation is CaCO 3 ( s ) → CaO ( s ) + CO 2 ( g )
In one lab, thegas-collecting apparatus used a gas bulb with a volume of 257 mL. How many grams of CaCO 3 ( s ) need to be heated to prepare enough CO 2 ( g ) to fill this bulb to a pressure of 738 torr at a temperature of 23 °C ? The equation is CaCO 3 ( s ) → CaO ( s ) + CO 2 ( g )
In one lab, thegas-collecting apparatus used a gas bulb with a volume of 257 mL. How many grams of
CaCO
3
(
s
)
need to be heated to prepare enough
CO
2
(
g
)
to fill this bulb to a pressure of 738 torr at a temperature of
23 °C
? The equation is
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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