# Chemistry

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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 25-L 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 -

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.

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