At \( 300 \mathrm{~K} \), two liquids \( A \) and \( B \) form an ideal solution. The vapour pre...

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At \( 300 \mathrm{~K} \), two liquids \( A \) and \( B \) form an ideal solution. The vapour pressure of pure \( A \) and \( B \) are \( 400 \mathrm{~mm} \) and \( 600 \mathrm{~mm} \) respectively. If \( 1 \mathrm{~mol} \) of \( A \) and \( x \) moles of \( B \) are mixed, vapour pressure of solution becomes \( 550 \mathrm{~mm} \). What is value of \( x \) ?
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