Question

A flask filled with oxygen is heated from 5 degrees Celsius to 30 degrees Celsius. The starting pressure was 50 kPa, what is the final pressure? (Be sure to convert from Celsius to Kelvin, add 273 to your Celsius temperature to get the temperature to kelvin. Ex. 0 degrees Celsius id equal to 273 kelvin)

Answer 1

54.5kPa

Explanation:

Given parameters:

T₂ = 30°C = 30+273 = 303K

T₁ =  5°C = 5+273 = 278K

P₁ = 50kPa

Unknown:

P₂ = ?

Solution:

We can solve this problem using the combined gas law simplification and assuming that volume is constant as seen from the container:

            $\frac{P_{1} }{T_{1} } = \frac{P_{2} }{T_{2} }$

Making the unknown the subject of the formula:

            P₂ = $\frac{P_{1} T_{2} }{T_{1} }$

             P₂ = $\frac{50 x 303}{278}$ = 54.5kPa

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