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Wednesday, January 12, 2011

Molar Volume of a Gas at STP

Sup, followers... or follower. Happy New Year and the like.

Pro Tip: When you read a word that is not actually a word and is in all CAPS it is usually an acronym.

SO WHAT COULD STP STAND FOR?


ALL WRONG


except for the last one, that one is correct

Standard Temperature and Pressure are measurements of temperature and pressure that are common in most experiments to allow easier comparison and contrast between different experiments. We want to keep these measurements the same because gases contract and expand as these measurements differentiate.

These measurements are  
Temperature: 0 °C (273.15 K, 32 °F)
Pressure: 1 At the Moment (atm)...............................................................atmosphere

Also: at STP, 1 mole of gas will have a volume of 22.4L

SO WITH ALL OF THAT SAID: MOLE CONVERSION TIME!!!!!!!!!

as with any mole conversion, we need conversion factors!

If 22.4L = 1 mole THEN:
22.4L/1mole OR 1mole/22.4L


Example Question:

Calculate how many moles of NH3 are in 5.6L of gas at STP

(5.6L of gas)(1 mole NH3/22.4L of gas)

L of gas cancel out

(5.6/22.4)moles of NH3

0.25 moles of NH3


dude with some what seems like a Beta version of MS paint teaches you about STP

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