作者oscillator (系勻)
看板Chemistry
標題[問題]普化考古題-氣體分子動力
時間Wed Jan 25 11:12:12 2012
A box contais pure oxygen molecule at 1atm ,room temperture 298K
calculate
(a) the average kinetic energy of ONE molecule
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(3/2*1*8.314*298)/Na=6.2*10^-21 J
Na=亞佛加覺數
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(b) the root mean square velocity of A molecule
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6.2*10^-21J = 1/2 * 0.016/Na *u^2 求得 u=682m/s
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(c) suppose that the molecule can be view as a sphere with the radius
r=0.15nm , estimate the number of collisions per molecule within a
second.
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有u/L=1/t 由氣壓換算得邊常=13.53m 然後就不知道怎麼運用分子邊常求..
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(d) if one out of 10^5 collisons will make a reaction, one can estimate the
reaction rate using the answer of (c) and what is the order of the
reaction
謝謝花時間幫我看的強者 最後祝大家新年快樂
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1F:推 b8951007:ab應該就是那樣算,d的話通常是二級反應 01/26 13:22
2F:→ oscillator:我還想會不會前面就錯的一塌糊塗了XD 01/27 14:40
3F:推 b8951007:OK的..至於c選項是有碰撞頻率公式,不過這題我不確定帶進 01/27 18:23
4F:→ b8951007:去對不對,就沒PO出來獻醜了 01/27 18:24
5F:→ oscillator:還是很謝謝你~ 01/28 09:57
6F:推 Chantaljones:C的話就是算ZAA吧? 01/29 00:48
7F:推 Chantaljones:只是nA要帶入1吧? 01/29 00:51
8F:→ oscillator:Z= 2*d^2*(pi*k*T/Na*m)^0.5 *(N/V)^2 這式嘛? 01/29 16:53
9F:→ oscillator:然後只討論一個 所以N=1 Na=1 這樣嘛? 01/29 16:53
10F:推 b8951007:ZA=2^1/2*pi d^2*<v>*<N/V> 你的那個是在算Zab的 01/30 15:11
11F:→ b8951007:抱歉你那個應該試算ZAA的,而且是要帶平均速度公式,但我猜 01/30 15:18
12F:→ b8951007:用B的速度帶進去就OK了...保險一點就是帶平均速度 01/30 15:19
13F:→ b8951007:單位就看你怎麼變,叫常見的是sec^-1*m^-3 01/30 15:22
14F:→ oscillator:謝謝你 我明白了 01/30 16:18