The incomplete table below shows a comparison of the different gas laws. Name Variables Constants Equation Boyle's law pressure, volume ? cap p sub 1 cap v sub 1 is equal to cap p sub 2 cap v sub 2 Charles’s law volume, temperature ? the fraction with numerator cap v sub 1 and denominator cap t sub 1 is equal to the fraction with numerator cap v sub 2 and denominator cap t sub 2 ? temperature, pressure volume, moles of gas the fraction with numerator cap p sub 1 and denominator cap t sub 1 is equal to the fraction with numerator cap p sub 2 and denominator cap t sub 2 ? pressure, temperature, volume ? the fraction with numerator cap p sub 1 cap v sub 1 and denominator cap t sub 1 is equal to the fraction with numerator cap p sub 2 cap v sub 2 and denominator cap t sub 2 What is assumed to be constant when using the combined gas law?
C
pressure and temperatureThe combined gas law relates pressure, volume, and temperature: P₁V₁/T₁ = P₂V₂/T₂. Since all three can change in this relationship, the amount of gas must stay the same; in other words, the number of moles is constant. The correct choice is “number of moles.”
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