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How this equation is derived ?dG = VdP |
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Answer» We know that, du = Tds - Pdv------(i) dH = du + pdv + vdp-----(ii) and dG = dH - Tds - sdT------(iii) Putting the value of dv in equation (ii), we got--- dH = Tds - pdv + pdv + vdp dH = Tds + vdp------(iv) Putting the value of dH from equation (iv) to equation (iii), we got dG = Tds + vdp - Tds - sdT dG = vdp - sdT at constant temperature dT = 0 \(\therefore\) dG = vdp, at constant temperature. |
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