More practice questions

4. Q4. Express −40 °C in kelvin.

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   T = −40 + 273.15 = 233.15 K.

5. Q5. A gas at 1.0 atm, 2.0 L and 300 K is brought to 3.0 atm and 450 K. Find its new volume.

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   V₂ = V₁ × (P₁/P₂) × (T₂/T₁) = 2.0 × (1.0/3.0) × (450/300) = 1.0 L.

6. Q6. Express R = 8.31 J mol^⁻¹ K^⁻¹ in L atm mol^⁻¹ K^⁻¹, using 1 L atm = 101.3 J.

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   8.31/101.3, about 0.0820 L atm mol^⁻¹ K^⁻¹ (0.0821 with R = 8.314 J mol^⁻¹ K^⁻¹).