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Openai/691371b1-7230-8010-b628-87d4fc82f6d3
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=== Assistant: Bình tích V không đổi, nhiệt độ không đổi ⇒ khí lý tưởng cho ta === Bình tích (V không đổi), nhiệt độ không đổi ⇒ khí lý tưởng cho ta pV=mRT ⇒ m∝p(V,T khoˆng đổi).pV=mRT \;\Rightarrow\; m\propto p \quad (V,T\ \text{không đổi}).pV=mRT⇒m∝p(V,T khoˆng đổi). Sau khi dùng hết 1 kg1\,\text{kg}1kg O2_22: m1−m2=1vaˋmi=piVRTm_1-m_2=1 \quad\text{và}\quad m_i=\frac{p_iV}{RT}m1−m2=1vaˋmi=RTpiV ⇒ 1=(p1−p2)VRT ⇒ V=RTp1−p2.\Rightarrow\; 1=\frac{(p_1-p_2)V}{RT} \;\;\Rightarrow\;\; V=\frac{RT}{p_1-p_2}.⇒1=RT(p1−p2)V⇒V=p1−p2RT. Thay số (O2_22: R=259.8 J/(kg\cdotpK)R=259.8\ \text{J/(kg·K)}R=259.8 J/(kg\cdotpK); T=22∘C=295 KT=22^\circ\text{C}=295\ \text{K}T=22∘C=295 K). Dùng “at” = at kỹ thuật =98.0665 kPa=98.0665\,\text{kPa}=98.0665kPa: p1−p2=(62−30) at=32×98.0665×103=3.138×106 Pa.p_1-p_2=(62-30)\,\text{at}=32\times 98.0665\times10^3 =3.138\times10^6\ \text{Pa}.p1−p2=(62−30)at=32×98.0665×103=3.138×106 Pa. V=259.8×2953.138×106≈2.44×10−2 m3=0.0244 m3 (≈ 24.4 L).V=\frac{259.8\times 295}{3.138\times 10^6} \approx 2.44\times10^{-2}\ \text{m}^3 = \boxed{0.0244\ \text{m}^3\ \text{(≈ 24.4 L)}}.V=3.138×106259.8×295≈2.44×10−2 m3=0.0244 m3 (≈ 24.4 L). (Nếu hiểu “at” là atm = 101.325 kPa, thì V≈0.0236 m3V \approx 0.0236\ \text{m}^3V≈0.0236 m3 ≈ 23.6 L — chênh ~3%.)
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