where we find mole xd?
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The minimum reflux rate can be determined mathematically from the endpoints of the rectifying line at minimum reflux -- the overhead product composition point (xD,xD) and the point of intersection of the feed line and equilibrium curve (x', y'). The derivation of this formula is given later.
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Use the molecular formula to find the molar mass; to obtain the number of moles, divide the mass of compound by the molar mass of the compound expressed in gram
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