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Pressure of Ig of an ideal gas A at 27^@...

Pressure of Ig of an ideal gas A at `27^@C` is found to be 2 bar. When 2g of another ideal gas B is introduced in the same flask at same temperature, the pressure becomes 3 bar, then `M_B` = ____ `M_A`

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The correct Answer is:
4
`P_A = 2 "bar" , P_B = 3 - 2 = 1 "bar"`.
`P alpha n implies (n_A)/(n_B) = 2/1 , (1//M_A)/(2//M_B) implies (M_B)/(M_A) = 4`.
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