Chemistry, ideal gas law and Dalton's law?

Question

What is the volume of a container of it holds 33 grams of carbon dioxide at STP?

Also

Calculate the number of moles of gas in a 3.0L balloon of AR at STP

thankyou!!

Answer 1

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STP is standard temperature (0 deg Celcius) and pressure (1.00 atm)

At STP 1 mole of any ideal gas occupies a volume of 22.4 L

moles CO2 = mass / molar mass

= 33 g / 44.01 g/mol

= 0.7498 mol

Volume at STP = moles x 22.4 L/mol

= 0.7498 mol x 22.4 L/mol

= 16.796 L

= 17 L (2 sig figs)

At STP moles = volume (L) / 22.4 L/mol

moles Ar = 3.0 L / 22.4 L/mol

= 0.13 mol