Posted by Anonymous on .
1. A sample of argon gas is at a pressure of 1.24 x 10^4 kPa and a temperature of 24°C in a rigid 25L tank. How many moles of argon does this tank contain?
I ended up with .130 but its 130
Can someone tell me what I did wrong?
This whole chapter on gases is really confusing to me and it would help if someone explained it

Chemistry 
Dr Russ,
Possibly the conversion of kPa? Which gas constant did you use?
As an estimate
1.24 x 10^ 4 kPa is approximately 124 atmospheres.
If 1 mole of a gas occupies 22.4 L at STP
Then the number of moles is very approximately
124 x 25/22.4 moles = 138 moles
PS  remember to include the leading zero when writing a decimal as the dot is very easy to miss.