Collecting gas over water This question is modeled after Silberberg, sample problem 4.10. Acetylene (C2H2), an important fuel in welding, is produced in the laboratory when calcium carbide reacts with water. (Note that this is an interesting acid-base reaction. Can you identify the acid and the base, and which definitions apply?) CaC2(s) + 2 H20 – C2H2(g) + Ca(OH)2(aq). Provide answers as numbers (not scientific notation) without units; for full credit, the last digit must be within +1 of the true value and the number of significant figures must be correct. A 0.155-g sample of calcium carbide is reacted with excess water. The amount of acetylene gas produced is moles or g. Cpy The MGrI Conparien n Pei reged te mden er dapay The acetylene gas produced is collected over water at 26 °C; the total gas pressure is 735 torr. Look up the vapour pressure of Table 5.2 Vapor Pressure water at 26 °C in the table shown. The partial pressure of acetylene gas in units of atm, to the correct number of significant figures of Water (Po) at Different T (note that a subtraction is involved), is atm. T (°C) PH,o(torr) T (°C) PH,0(torr) 4.6 6.5 40 55.3 71.9 5 45 The volume of acetylene gas collected (in mL) is mL. 9.2 10.5 12.0 13.6 15.5 17.5 19.8 22.4 25.2 28.3 50 55 60 65 70 75 80 85 90 95 100 92.5 118.0 149.4 187.5 233.7 289.1 355.1 433.6 525.8 633.9 10 12 14 16 18 20 22 24 26 28 30 35 31.8 42.2 760.0
Collecting gas over water This question is modeled after Silberberg, sample problem 4.10. Acetylene (C2H2), an important fuel in welding, is produced in the laboratory when calcium carbide reacts with water. (Note that this is an interesting acid-base reaction. Can you identify the acid and the base, and which definitions apply?) CaC2(s) + 2 H20 – C2H2(g) + Ca(OH)2(aq). Provide answers as numbers (not scientific notation) without units; for full credit, the last digit must be within +1 of the true value and the number of significant figures must be correct. A 0.155-g sample of calcium carbide is reacted with excess water. The amount of acetylene gas produced is moles or g. Cpy The MGrI Conparien n Pei reged te mden er dapay The acetylene gas produced is collected over water at 26 °C; the total gas pressure is 735 torr. Look up the vapour pressure of Table 5.2 Vapor Pressure water at 26 °C in the table shown. The partial pressure of acetylene gas in units of atm, to the correct number of significant figures of Water (Po) at Different T (note that a subtraction is involved), is atm. T (°C) PH,o(torr) T (°C) PH,0(torr) 4.6 6.5 40 55.3 71.9 5 45 The volume of acetylene gas collected (in mL) is mL. 9.2 10.5 12.0 13.6 15.5 17.5 19.8 22.4 25.2 28.3 50 55 60 65 70 75 80 85 90 95 100 92.5 118.0 149.4 187.5 233.7 289.1 355.1 433.6 525.8 633.9 10 12 14 16 18 20 22 24 26 28 30 35 31.8 42.2 760.0
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Transcribed Image Text:Collecting gas over water
This question is modeled after Silberberg, sample problem 4.10. Acetylene (C2H2), an important fuel in welding, is produced in the laboratory when calcium
carbide reacts with water. (Note that this is an interesting acid-base reaction. Can you identify the acid and the base, and which definitions apply?)
CaC2(s) + 2 H2O → C2H2(g) + Ca(OH)2(aq).
Provide answers as numbers (not scientific notation) without units; for full credit, the last digit must be within +1 of the true value and the number of significant
figures must be correct.
A 0.155-g sample of calcium carbide is reacted with excess water. The amount of acetylene gas produced is
moles or
g.
The acetylene gas produced is collected over water at 26 °C; the total gas pressure is 735 torr. Look up the vapour pressure of
water at 26 °C in the table shown. The partial pressure of acetylene gas in units of atm, to the correct number of significant figures
Table 5.2 Vapor Pressure
of Water (PH.o) at Different T
(note that a subtraction is involved), is
atm.
T (°C) PH,0(torr) T ("C) Pr,0(torr)
55.3
71.9
4.6
40
6.5
45
The volume of acetylene gas collected (in mL) is
mL.
9.2
10.5
10
50
92.5
12
55
118.0
12.0
13.6
15.5
17.5
14
60
149.4
16
18
20
22
24
65
187.5
233.7
289.1
355.1
70
75
80
19.8
22.4
85
433.6
26
25.2
28.3
31.8
42.2
90
28
30
35
525.8
633.9
760.0
95
100
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