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  4. Consider the following vapour pressure-composition graph, SP is equal to

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Q. Consider the following vapour pressure-composition graph, $SP$ is equal toChemistry Question Image

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Solution:

$P _{ S }= P _{ A }^{0} \cdot x _{ A }+ P _{ B }^{0} \cdot x _{ B }$
$SP = P _{ A }^{0} \times 0.2+0.8 \times P _{ B }^{0}$
$SP = SR + SQ$