2.00 moles of a typical gas would occupy how many liters at 1 atm and 0◦c?

Explanation:

You can deal with this question using two different but related approachs.

1) First approach: 1 mole of gas at 1 atm and 0°C occupy 22.4 liter.

With that you can set a proportion:

⇒ V = 2.00 mole × 22.4 liter / 1 mole = 44.8 liter.

2) Second approach: use ideal gas equation:

⇒ V = nRT / p

There, the two calculations yield the same result, although the second one is more accurate only if you need to use 3 or more significant digits, which is not correct in this case.

If you measure the presure as 1.0 atm (two significant digits) and the temperature as 0.0 °C (two significant digits), the volume must be resported with two significant digits, which yileds to the same result with both calculations: 45 liter.

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