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# Ideal gas equations watch

1. Find the volume of ethyne (C2H2) that can be prepared from 10.0g of calcium carbide at 20C and a pressure of 100kPa.
The answer is meant to be 0.00380m3 but I don't get this answer.
I did:
V=nrt/p
N ?
R 8.31
T 100000
P 273
2. (Original post by 11ashh)
Find the volume of ethyne (C2H2) that can be prepared from 10.0g of calcium carbide at 20C and a pressure of 100kPa.
The answer is meant to be 0.00380m3 but I don't get this answer.
I did:
V=nrt/p
N ?
R 8.31
T 100000
P 273
First, you have the numbers for T and P the wrong way round !
Secondly, 20oC is 293Kelvin (not 273K)

After that you have to work out how many moles are in 10.0grams of calcium carbide and then use

CaC2 + 2H2O --> C2H2 + Ca(OH)2

To work out how many moles of ethyne this will produce, once you've done that then use V= nRT/ p to get the answer
3. (Original post by 11ashh)
Find the volume of ethyne (C2H2) that can be prepared from 10.0g of calcium carbide at 20C and a pressure of 100kPa.
The answer is meant to be 0.00380m3 but I don't get this answer.
I did:
V=nrt/p
N ?
R 8.31
T 100000
P 273
pV=nRt
so

t=20+273=293
R=8.31
p=100,000

so

i'm sure you can finish the rest
4. (Original post by MexicanKeith)
First, you have the numbers for T and P the wrong way round !
Secondly, 20oC is 293Kelvin (not 273K)

After that you have to work out how many moles are in 10.0grams of calcium carbide and then use

CaC2 + 2H2O --> C2H2 + Ca(OH)2

To work out how many moles of ethyne this will produce, once you've done that then use V= nRT/ p to get the answer
Thank you! I've just started my A levels and I have so many calculations to do for homework it starts to confuse me!

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