【問題】理想氣體

[sam5831378 10]

老師出的平考 他說無聊所以來個英文命題 其實沒差啦 題目還看得懂

但是有幾題覺得答案怪怪的 所以上網問一下

1.Bubble of oxygen from photosynthesis from on the lerves of an underwater plant at a depth

of 131 ft .If the plant is growing near the coast of New Jersey on a day on which the

atmospheric pressure is 729 mmHg , what is the pressure of the oxygen gas in one of the

bubble mentioned above

我的作法是 (131*30.48)/100=39.92 然後每十公尺增加一大氣壓 39.92/10 = 3.992 atm

3.992+729/760 =4.952 atm 請問這作法對嗎??? 答案是 4.82atm

2.if the pressure of a sample of gas with a constant of moles is quadrupled

and the absolute temperature is doubled ,by what factor does the volum of the

sample change?

其實這邊我第一段看不太懂 不知道是壓力為常數還是莫兒數為常數

答案是 1/2

3.How many liters of chlorine gas at 650 mmHg and 25(度C) can be produced by the

reaction of 2.0L of 2,5M Hcl solution with excess MnO2?

1MnO2(s) +4HCl(aq)---->1MnCl2(aq) +2H2O(l) +1Cl2(g)

我的作法是;(650/760 )*V=2.5*0.082*298 V=71.4L

再根據係數比 71.4L/4 = 17.85L 但是答案為35,7L 不知是哪裡算錯?

4. Calculate the number of molecules per cm^3 in a sample of N2 gas at 25(度C)

and 650 mmHg .

這一題我覺得條件不夠 還是可以算只是我不會算 = =

謝謝大家回答

[Zeta 10]

其實這邊我第一段看不太懂，不知道是壓力為常數還是莫兒數為常數

2.if the pressure of a sample of gas with a constant of moles is quadrupled

and the absolute temperature is doubled ,by what factor does the volum of the

sample change?

這段文字是這樣說的：『倘若具有固定莫爾數的氣體試樣壓力變為四倍，同時絕對溫度變為兩倍，則影響氣體試樣體積改變的因素是什麼？』

這樣寫不知道對不對，factor 我忘了要怎麼翻了，若是問體積改變的倍數，答案則是1/2沒有錯

4. Calculate the number of molecules per cm^3 in a sample of N2 gas at 25(度C)

and 650 mmHg .

這一題我覺得條件不夠 還是可以算只是我不會算 = =

條件足夠，這題主要是作單位換算，重點是氣體常數R的單位選擇與換算

哈哈，我的學業還給老師還真是還的很乾淨啊==

[react 10]

我的作法是 (131*30.48)/100=39.92 然後每十公尺增加一大氣壓 39.92/10 = 3.992 atm

3.992+729/760 =4.952 atm 請問這作法對嗎??? 答案是 4.82atm

1atm=1033.6cm.H2O