A) 10.8 cm of Hg
B) 18.9 cm of Hg
C) 28.8 cm of Hg
D) 39.9 cm of Hg
Correct Answer: A
Solution :
Here values are \[{{P}_{1}}=76\,cm\]of Hg [Initial pressure at N.T.P] \[{{P}_{2}}=?,\,{{V}_{1}}=5\,\text{litre,}{{\text{V}}_{2}}=30+5=35\,\text{litre}\] According to the Boyle's law: \[{{P}_{1}}{{P}_{2}}={{P}_{2}}{{V}_{2}}\] \[76\times 5={{P}_{2}}\times 35\] \[{{P}_{2}}=\frac{76\times 5}{35}\] \[=10.8\,cm\]of Hg Hence, the correct option is (a).
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