# A given amount of gas occupies 10.0 dm3 at 4 atm and 273°C

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QuizTablet Community! ## A given amount of gas occupies 10.0 dm3 at 4 atm and 273°C. The number of moles of the gas present is…

[Molar volume of a gas at stp. = 22.4 dm3 ]

A. 0.89 mol

B. 1.90 mol

C. 3.80 mol

D. 5.70 mol

A

## SOLUTION…

Be careful…

We know that 1 mole of gas occupies 22.4 dm3 in volume, but this is at STP.

Now STP = standard temperature and pressure = 273K and 1 atm

In this question, we are given the volume at 4 atm and 273 degree Celsius, we must use this to find the volume at STP ( 273K, 1atm), and then use this new volume to calculate the right number of moles.

So, we will use the general gas equation:

### Now for the right answer to the above question:

1. Option A is correct.
2. Option B is incorrect.
3. C is incorrect.
4. D is not the correct answer.

## QUICK TIPS…

• 22.4 dm3 is the standard volume of 1 mole of all gasses at STP.
• If a volume is given at other conditions, then use gas laws to reconvert to STP conditions before calculating the appropriate number of moles.
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Use the questions and answers session to deal further on this topic…

/ culled from 2018 JAMB-UTME Chemistry question 29 /

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