✔ 最佳答案
「已知......」
T1 = 300 K, P1 = 30 atm, T2 = 400 K, P2 = ? atm
P1/T1 = P2/T2
30/300 = P2/400
P2 = 40 atm
逸出氣體分壓 = 40 - 1 = 39 atm
逸出氣體重量 = 480 x (39/40) = 468 g
「同溫......」
PV = (m/M)RT ⇒ m = MPV/RT
(A) m = (16x2)(3)V/RT = 96V/RT
(B) m = (1x2)(8)V/RT = 16V/RT
(C) m = (4)(10)V/RT = 40V/RT
(D) m = (12+16x2)(2)V/RT = 88V/RT
「327°C......」
反應後容量內氣體的質量 = 10 g
反應後容量內氣體的體積 = 50 L
反應後容量內氣體的密度 = 10/50 = 0.2 g/L
1.
氣體抽出前:P1 = 650 - 600 = 50 mmHg, V1 = 容器容積 = ? mL
氣體抽出後:P2 = 1 atm = 760 mmHg, V2 = 100 mL
P1V1 = P2V2
50V1 = 760 x 100
V1 = 1520 mL
4.
設所求高度為 h cm。並設橫切面積為 A cm²。
P1 = (75 - 70) cmHg = 5 mmHg, V1 = (85 - 70)A = 15A cm³
P2 = (h- 60) cmHg, V2 = (85 - 60)A = 25A cm³
P1V1 = P2V2
(5)(15A) = (h - 60)(25A)
h = 63 (cm)
5.
設所求之距離為 h cm。並設管橫切面積為 A cm²。
P1 = 76 cmHg, V1 = 152A cm³
P2 = (76 + h) cmHg, V2 = (152 - h)A cm³
P1V1 = P2V2
(76)(152A) = (76 + h)(152 - h)A
h² - 76h = 0
h(h - 76) = 0
h ≠ 0, 所以 h = 76 (cm)
6.
P1 = 1 atm, V1 = 1200 L
P2 = 120 atm, V2 = ? L
P1V1 = P2V2
1 x 1200 = 120V2
V2 = 10 L
9.
T1 = 350 K, V1 = 3.50 L
T2 = ? K, V2 = 3.00 L
V1/T1 = V2/T2
3.50/350 = 3.00/T2
T2 = 300 K = 27°C
10.
T1 = 273 K, V1 = 546 mL
T2 = 303 K, V2 = ? mL
V1T1/V2/T2
546/273 = V2/303
V2 = 606 mL
體積增加 = 606 - 546 = 60 mL
16.
P1 = 2 atm, T1 = 300 K
P2 = 2.5 atm, T2 = ? K
P1/T1 = P2/T2
2/300 = 2.5/T2
T2 = 375 K = 102°C
17.
PV = nRT
(2.02 x 10⁴)V = 0.1 x 8.314 x 300
V = 1.2 x 10⁻² m³
18.
若壓力不變,V1/T1 = V2/T1
V2/V1 = 293/283 = 1.035
同理,若體積不變,P2/P1 = 293/283 = 1.035
(A) 至 (D) 均不是答案。
20.
考慮 1 L混合物。
PV = nRT
0.5 x 1 = n x 0.082 x (273 + 127)
n = 0.01524
設混合物含 y mol CH4。
y(12 + 1x4) + (0.01524 - y)(12x3 + 1x8) = 0.35
16y + 0.6706 - 44y = 0.35
y = 0.01145
莫耳數比 CH4 : C3H8 = 0.01145 : (0.01524 - 0.01145) = 3 : 1
21.
T1 = 300 K, V1 = (1 - 20%) = 0.8V
T2 = (273 + X) K, V2 = V
V1/T1 = V2/T2
0.8V/300 = V/(273 + X)
X = 102
22.
PV = (m/M)RT ⇒ M = mRT/PV
M = (0.5)(0.082)(273 + 40) / (190/760)(1.6)
分子量 M = 32
(A) C4H8 的分子量 = 12x4 + 8 = 52
(B) CH3OH 的分子量 = 12x1 + 1x4 + 16 = 32
(C) C2H5OC2H5 的分子量 = 12x4 + 1x10 + 16 = 74
(D) CH3COCH3 的分子量 = 12x3 + 1x6 + 16 = 58