, 26.12.2019vanvalenpeyt

# A5.00 l volume of methane gas is cooled from 298 k to 149 k. if the pressure remains constant, what is the final volume in liters?

The correct answer is  "c".  it is "c" because melting is an endothermic change, and endothermic get's energy from surroundings.

The final volume of methane gas = 2.5 L

Explanation:

Charles' Law: Charles'  law states that the volume of a given mass of gas is directly proportional to it's absolute temperature provided the pressure remains constant.

From Charles' law

V₁/T₁ = V₂/T₂

Making V₂ The subject of the equation above,

V₂ = (V₁/T₁)T₂ equation 1

Where V₁ = initial Volume, T₁ Initial Temperature, V₂ = Final Volume, T₂ = final Temperature.

Given: V₁ = 5.00 L, T₁ = 298 K, T₂ = 148 K

Substituting these values into equation 1

V₂ = (5.00/298)149

V₂ = 2.5 L.

Therefore the final volume of methane gas = 2.5 L

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