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# A vessel is filled with an ideal gas at 76 cm of Hg (mercury). The mass of gas is increased by 25% by introducing more gas at the same temperature. What is the resultant pressure of Hg in cm?

(A) 76 (B) 95 (C) 60.8 (D) 152

At constant Pressure, Temperature and Volume, $P\; \alpha\; n\; \rightarrow \large\frac{P_1}{P_2} $$=\large\frac{n_1}{n_2} \Rightarrow P_2 = \large\frac{P_1\;n_2}{n_1}$$ = \large\frac{1.25P_1}{1}$$= 1.25 P_1 =$95cm of Hg.