proportionalTo do List

to do list  时间:2021-01-28  阅读:()

Gas Laws Practice Test

Solutio n Set

1. A Which ofthe following conditions would cause a gas to deviate most from idealbehavior?

A) -200oC and 50 atm; B)STP; C)200 K and 500 psi; D)2000oC and 500 mmHg.

(low T&high P)

2. F Which ofthe following gases would have the greatest average kinetic energy,assuming that allgases are at the same average temperature?

A)helium; B)xenon; C)carbon dioxide; D)ammonia; E)carbon monoxide;

F)all gases have the same average kinetic energy at a given temperature.

3. E Assume that you have 2.0 moles of gas at a certain temperature,pressure,and volume. If both thepressure and absolute temperature are tripled,what will be the final volume?

A)nine times as great as the initial volume; B)nine times less than the initial voume;

C) three times as great as the initial volume; D) three times less than the initial voume;

E) there will be no change in volume; F)final volume will be greater,but not nine times greater.

4. C One way to increase the average speed of the molecules ofan ideal gas is to:

A)decrease the temperature; B)expand the gas against a piston; C) increase the pressureby increasing the number of molecules in a confined volume(a container that has a fixed volume);

D)expanding the gas into a vacuum.

5. A Density is a characteristic property for any gas,but the temperature and pressure must also bespecified because:

A)density increases with increasing pressure at a given temperature;

B)density decrease s with increasing pre ssure at a given temp erature;

C)density increases with increasing temperature at a given pre ssure;

D)density increases with decreasing pres sure and increased temperature.

6. E Which ofthe following would cause an increase inthe pressure ofa gaseous system?

A)container is made larger,with temperature and moles constant;

B)additional amount of the gas is added,with volume and temperature kept constant;

C) temperature is decreased,with moles and volume constant;

D)another gas is added to the system,with volume and temperature kept constant;

E)both B and D would increase pressure.

7. C What is the relationship ofthe mass ofa gaseous molecule compared to its velocity,assuming thattemperature,pressure,and volume are kept constant?

A) inversely proportional; B)directly proportional; C) inversely proportional to the squareroot; D)directly proportional to the square of the velocity.

8. E At extemely highpressures,which of the following molecules would be expected to show themost deviation from ideal behavior?

A)neo n; B)hydro ge n; C)argo n; D)o xyge n; E)d initro ge n pe nto xide;

F)all would deviate equally.

-2-

9. B What is the molecular weight ofa gas if 0.3350 grams in a 30.0 ml container exerts a pressure of

20.3 psi at a temperature of-20.0?

A)88.6; B) 168; C) 127; D)32.7; E)355; F)22.9

MW=gRT/PV=[(0.3350 g)(0.0821)(253 K)] / [(20.3 psi/14.7 psi)(0.0300 liters)]

MW=167.96g/mol

10. B How many seconds will it take for 750 ml of xenon gas to effuse from an effusion chamber if ittakes 23.3 seconds for 750 ml of nitrogen gas to effuse?

A)71.4; B)50.5; C) 109; D) 10.8; E)4.69; F)23.3

=> Time Xen on/23.3 = 131.3/28.0

TimeXenon=50.5 sec.

11. E A sample of gas is put into a container that has a movable piston. Initially the volume is 4.00 literswhenthe pressure is 60.0 cm Hg and the temperature is 50.0the pressure is tripled(up to 180.0 cm Hg)and the temperature is also tripled(up to 150.0)?

A)0.444; B)36.0; C)4.00; D)8.85; E) 1.75; F)2.85

V1 P1 /T1 =V2 P2 /T2

V2 = [(4.00 liters)(60.0 cm)/ (323 K) ] / [(423 K)/(180.0 cm)] = 1.75 liters

12. A A three-gas system composed of neon,helium,and oxygen gas exerts a total pressure of 990.0 torr.Ifthe combined number of moles ofboth helium and neon is 10.0 moles,and the mass ofoxygenis 160.0 grams,what is the partialpressure exerted bythe oxygen gas?

A)330; B) 155; C) 165; D)660; E)495; F)990noxygen=160.0 g/32.0 g/mol=5.00 moles

Poxygen= 990.0 torr(5.00 mol/15.0 mol)=330.0 torr

-3-

13. C A student uses a manometer to determine the pressure of a confined gas in the lab. The barometershows that the atmosphe ric pressure is 28.80 inches Hg. The height ofthe mercury at the closedend of the manometer is 8.85 inches lower than the height of mercury at the open end.What isthe pressure of the confined gas (in atmospheres)?

A)597; B)225; C) 1.26; D)0.667; E) 1.33; F)0.963

Pgas=Patm+Ph=28.80 in.Hg+8.85 in.Hg =37.65 in.Hg = 1.26 atm.

14. D What is the density of bromine vapor(in grams/liter)at 775?

A)70.1; B)0.0556; C)3.38; D) 1.38; E)2.99; F) 1.72.

D= g/V=MWx P/RT

D= [(159.8 g/mol)(75.5 kPa/101.3 kPa)] / [(0.0821)(1048 K)]

D= 1.38 g/lite r

15. D 775 ml ofa gas is collected over water at a temperature of 23.0pressure of 12.20 psi.What would be the volume(in ml)of the dry gas at STP?

(Equilibrium vapor pressure ofwater vapor at 23.0.)

A)682; B)415; C)521; D)563; E)329; F)619.

V1 P1 /T1 =V2 P2 /T2

V2 = [(775 ml)(12.20 psi-0.62 psi)/(296 K) ] / [(273 K)/ (14.7 psi)] = 563 ml

16. B What is the density(in grams per liter)of sulfur dichloride vapor at STP conditions?

A) 1.24; B)4.60; C)22.4; D) 103.1; E)3.84; F)0.896

103.1 g/mol x 1 mol /22.4 liters = 4.60 g/liter

17. 82.8% A student reacts 1.50 moles of solid aluminum metal with an excess of 6.0 M sulfuric acid at

55.

What is the percent yield of this reaction? The aqueous vapor pressure at 55atmospheres. The other product is aluminum sulfate,but you knew that!

2 Al(s) +3 H2SO4(aq) --> 3 H2(g) + Al2(SO4)3(s)

1.50 mol Al x[3 mol H2 /2 mol Al ]=2.25 moles H2

V=nRT/P = [(2.25 mol)(0.0821)(328 K)] / [(0.445-0.045 atm)]V= 151 liters (theoretically) %yield=125/151 x 100=82.8%

lcloud零云:沪港IPLC,70元/月/200Mbps端口/共享IPv4/KVM;成都/德阳/雅安独立服务器低至400元/月起

lcloud怎么样?lcloud零云,UOVZ新开的子站,现在沪港iplc KVM VPS有端午节优惠,年付双倍流量,200Mbps带宽,性价比高。100Mbps带宽,500GB月流量,10个,512MB内存,优惠后月付70元,年付700元。另有国内独立服务器租用,泉州、佛山、成都、德阳、雅安独立服务器低至400元/月起!点击进入:lcloud官方网站地址lcloud零云优惠码:优惠码:bMVbR...

阿里云金秋上云季,云服务器秒杀2C2G5M年付60元起

阿里云(aliyun)在这个月又推出了一个金秋上云季活动,到9月30日前,每天两场秒杀活动,包括轻量应用服务器、云服务器、云数据库、短信包、存储包、CDN流量包等等产品,其中Aliyun轻量云服务器最低60元/年起,还可以99元续费3次!活动针对新用户和没有购买过他们的产品的老用户均可参与,每人限购1件。关于阿里云不用多说了,国内首屈一指的云服务器商家,无论建站还是学习都是相当靠谱的。活动地址:h...

RAKsmartCloud服务器,可自定义配置月$7.59

RAKsmart商家一直以来在独立服务器、站群服务器和G口和10G口大端口流量服务器上下功夫比较大,但是在VPS主机业务上仅仅是顺带,尤其是我们看到大部分主流商家都做云服务器,而RAKsmart商家终于开始做云服务器,这次试探性的新增美国硅谷机房一个方案。月付7.59美元起,支持自定义配置,KVM虚拟化,美国硅谷机房,VPC网络/经典网络,大陆优化/精品网线路,支持Linux或者Windows操作...

to do list为你推荐
软银集团日本软银是什么呀?304和316不锈钢哪个好304与316用哪个好?视频制作软件哪个好什么视频编辑软件比较适合小白的聚酯纤维和棉哪个好纯棉和聚酯纤维的最佳比例骁龙750g和765g哪个好骁龙765G,这里的g是什么意思?录屏软件哪个好手机录屏的话那个软件会好一点少儿英语哪个好少儿英语哪种的好?等额本息等额本金哪个好等额本金和等额本息哪个划算?如果想在5-10年内还清贷款哪类更划算一些?手机音乐播放器哪个好手机音乐播放器哪个好dnf魔枪士转职哪个好dnf平民魔枪士转什么好
哈尔滨域名注册 工信部域名备案查询 vps服务器 132邮箱 plesk diahosting webhostingpad 空间打开慢 线路工具 国内加速器 ftp教程 宁波服务器 服务器维护方案 softbank邮箱 网站cdn加速 福建铁通 华为云盘 东莞主机托管 免费asp空间申请 lamp什么意思 更多