A helium-filled balloon has a volume of 2.87 L at 15◦CThe volume of the balloon decreases to 2.46 L after it is placed outside on a cold day?
2018-04-11 7:43 am
A helium-filled balloon has a volume of 2.87 L at 15◦C. The volume of the balloon decreases to 2.46 L after it is placed outside on a cold day. What is the outside temperature in K?
回答 (1)
2018-04-11 10:09 am
Initial: V₁ = 2.87 L, T₁ = (273 + 15) K = 288 K
Outside: V₂ = 2.46 L, T₂ = ? K
For a fixed amount of gas at constant pressure: V₁/T₁ = V₂/T₂
Outside temperature, T₂ = T₁ × (V₂/V₁) = (288 K) × (2.46/2.87) = 247 K (to 3 sig. fig.)
Outside: V₂ = 2.46 L, T₂ = ? K
For a fixed amount of gas at constant pressure: V₁/T₁ = V₂/T₂
Outside temperature, T₂ = T₁ × (V₂/V₁) = (288 K) × (2.46/2.87) = 247 K (to 3 sig. fig.)
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