1气体

第1章气体

一、单选题

1、某气体AB，在高温下建立下列平衡∶AB(g)==A(g)＋B(g).若把1.00mol此气体在T=300K，P=101 kPa 下放在某密闭容器中，加热到600K时，有25.0%解离。此时体系的内部压力(kPa)为( ) A． 253 B． 101 C．50.5 D．126

2、一敞口烧瓶在7℃时盛满某种气体，欲使1/3 的气体逸出烧瓶，需加热到（）

A．100℃B．693 ℃C．420 ℃D．147 ℃

3、实际气体和理想气体更接近的条件是( )

A．高温高压 B. 低温高压 C. 高温低压 D. 低温低压

4、Ａ，Ｂ两种气体在容器中混合，容器体积为V，在温度T下测得压力为P，V A ，V B 分别为两气体的分体积，P A ，P B 为两气体的分压，下列算式中不正确的一个是( )

A. PV A = n A RT

B. P A V A =n A RT

C. P A V= n A RV

D. P A (V A+V B )= n A RT

5、某容器中加入相同物质的量的NO和Cl2，在一定温度下发生反应：

NO(g)+1/2Cl 2NOCl(g)。平衡时，各物种分压的结论肯定错误的

是（）

A. P(NO)=P(Cl2)

B. P(NO)=P(NOCl)

C. P(NO)

D. P(NO)>P(NOCl)

6、The height of a column of liquid supported by atmospheric pressure is inversely proportional to the density of the liquid. Mercury has a density of 13.6 g/mL. How high a column of water (density = 1.00 g/mL) would be supported by an atmospheric pressure of 0.876 atm? ( )

A. 9.05×103 mm

B. 1.03×104 mm

C. 49.0 mm

D. 11.9 mm

7、If you purchase a balloon filled with helium and take it outside on

a cold day, you will notice that it shrinks and becomes less buoyant. What gas law explains this observation? ( )

A. Boyle's

B. Charles's

C. Avogadro's

D. Graham's

8、A sample of gas occ upies 10.0 L at 50°C. Assuming that pressure is constant, what volume will the gas occupy at 100°C?( )

A. 10.0 L

B. 20.0 L

C. 11.5 L

D. 5.0 L

9、What is the Charles's law constant (in L/K) for 200 mg of carbon dioxide at 600 mm pressure? ( )

A. 4.73 10–4 L/K

B. 5.64 10–3 L/K

C. 42.0 L/K

D. 2.11 103 L/K

10、At a given temperature and pressure, which gas occupies the smallest volume per unit mass? ( )

A O2

B. Ar

C. CO2

D. Xe

11、At what temperature (in °C) will 25.0 g of carbon dioxide (at 1.00 atm) occupy. ( )

A. 188°C

B 461°C

C. –263°C

D. –270°C

12、What is the molar mass of a gas that has a density of 3.11 g/L at 100°C and 1.50 atm pressure? ( )

A. 0.152 g/mol

B. 95.2 g/mol

C. 17.0 g/mol

D. 63.5 g/mol

13、What volume of N2gas would be produced by the decomposition of 35.0

g NaN3 solid? (Assume that the gas is produced at 1.00 atm pressure and 150°C.)( )

A 28.0 L

B. 9.95 L

C. 18.7 L

D. 56.1 L

14、At what temperature would CO2 gas have the same average molecular speed as O2 gas has at 400 K? ( )

A. 250 K

B. 550 K

C. 400 K

D. 600K

15、How much faster does nitrogen escape from the balloon than oxygen? ( )

A. 1.07 times faster

B. 1.14 times faster

C. 0.875 times as fast

D. 0.935 times as fast

二、判断题（判断下列各项叙述是否正确，对，打“√”；错，打“×”。）

1、与理想气体相比，真实气体的相互作用力偏

小。（×）