A) 310 kPa
B) 210 kPa
C) 420 kPa
D) 365 kPa
E) 265 kPa
Correct Answer: E
Solution :
Total volume of two flasks = 1+ 3 = 4 If \[{{P}_{1}}\] the pressure of gas \[{{N}_{2}}\]in the mixture of \[{{N}_{2}}\]and \[{{O}_{2}}\]then P = 100 kPa , \[{{P}_{1}}=?\], V = 1 litre , \[{{V}_{1}}=4litre\] applying Boyle's law\[PV={{P}_{1}}{{V}_{1}}\] 100 ´ 1 = \[{{P}_{1}}\times 4\]; \[{{P}_{1}}=25\] If \[{{P}_{2}}\] is the pressure of \[{{O}_{2}}\] gas in the mixture of \[{{O}_{2}}\] and \[{{N}_{2}}\] then, 320 ´ 3 =\[{{P}_{2}}\times 4\]; \[{{P}_{2}}=240\] Hence, Total pressure \[P={{P}_{1}}+{{P}_{2}}=25+240\] \[=265\ kPa\]
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