A 100 mL flask contained H2 at 200 torr, and a 200 mL flask contained He at 100 torr. The two flask were, then connected so that each gas filled their combined volume. Assuming no change in temperature, total pressure is

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300 torr

66.66 torr

150 torr

133.33 torr

answer is D.

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Detailed Solution

nH2=pVRT=20000RT,nHe=pVRT=20000RT∴nH2+nHe=40000RT Total volume =300mLp=nVRT=40000RTRT×300 =4003=133.33 torr

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