GCEChemistryStates of Matter and Gas Laws2021

A fixed mass of gas occupies 500 cm³ at 27°C and 100 kPa. What volume will it occupy at 127°C and the same pressure?

A$\frac{500 \times 127}{27}$ cm³
B667 cm³CORRECT
C375 cm³
D2315 cm³
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Toaster Teacher
Why the answer is B, and why the others tempt you.
Using Charles's Law: V₁/T₁ = V₂/T₂. Converting temperatures: T₁ = 27 + 273 = 300 K, T₂ = 127 + 273 = 400 K. Therefore V₂ = (500 × 400)/300 = 666.7 ≈ 667 cm³. Option A is a common error of using Celsius instead of Kelvin, C results from inverting the ratio, and D is a distractor from incorrect unit conversion.
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