Standard Room Temperature ?

electriic_ink

15

Is room temperature taken to be 20^oC or 25^oC?

Reply 1

pow1990

I thought standard temperature(STP) was 25 degrees and room temperature(RTP) was 20 degrees.

Reply 2

electriic_ink

OP

15

pow1990

I thought standard temperature(STP) was 25 degrees and room temperature(RTP) was 20 degrees.

Well Wikipedia says Room Temperature is 20^oC

http://en.wikipedia.org/wiki/Room_temperature

but I always thought it was 25. Clearly, what has happened is that I have confused Standard Temperature and Room Temperature. What's the difference between the two?

Reply 3

Revd. Mike

17

Standard temperature is the one you assume for your reactions and stuff, if no conditions are stated, and it's 298.15K, so 25*C. Although tbh the temperature of our labs at work is almost invariably 20*C lol.

Reply 4

sam161

7

Just if this helps at all, it might vary depending on the exam board... Sounds stupid but hey. In my Salters Chemical Ideas book it says the following:

At Standard Temperature and Pressure (s.t.p) the molar vol. of a gas is 22.4dm^3.
s.t.p means a temperature of 0C (273K) and 1 atmosphere pressure

At Room Temperature and Pressure (r.t.p) the molar vol. of a gas is 24dm^3.
r.t.p means a temperature around 25C (298K) and 1 atmosphere pressure.

Might help? It will probably be in the book for the course if you've got one. All this was under "Calclations Involving Gases" in Chemical Ideas.

Reply 5

Delta Aitch

13

I always wrote it as 25*C (298 K)

Reply 6

sam161

7

Room temperature yeah. Calling it standard room temperate is a bit odd, because its either standard temp and pressure, or room temp and pressure. Standard room is just confusing haha.

I do know what you mean thought =]

Reply 7

sorinipopa

Original post by sam161

Just if this helps at all, it might vary depending on the exam board... Sounds stupid but hey. In my Salters Chemical Ideas book it says the following:

At Standard Temperature and Pressure (s.t.p) the molar vol. of a gas is 22.4dm^3.
s.t.p means a temperature of 0C (273K) and 1 atmosphere pressure

At Room Temperature and Pressure (r.t.p) the molar vol. of a gas is 24dm^3.
r.t.p means a temperature around 25C (298K) and 1 atmosphere pressure.

Might help? It will probably be in the book for the course if you've got one. All this was under "Calclations Involving Gases" in Chemical Ideas.

Do you have a link for this Room Temperature definition?

Thanks

Reply 8

benjaminlukas

3

If room temperature taken as 25 C the vol of gas calculated using PV = n.RT would be 24.4 l (P=1 Atm, R=0.082, T=273 25=298)If room temperature taken as 20 C then using the same formula V= 24 l.