If a volume containing gas is compressed to half, how many moles of gas remained in the vessel ?

If volume containing gas' is compressed to half, moles of gas remained in the vessel will be:

A vessel is filled with an ideal gas at a pressure of 10 atm and temperature 27^@C . Half of the mass of the gas is removed from the vessel and temperature of the remaining gas is increased to 87^@C . Then, the pressure of the gas in the vessel will be

A vessel is filled with an ideal gas at a pressure of 10 atmospheres and temp 27^(0)C . Half of the mass of the gas is removed from the vessel the temperature of the remaining gas is increased to 87^(0)C . Then the pressure of the gas in the vessel will be

Consider two containers A and B containing identical gases at the same pressure, volume and temperature. The gas in container A is compressed to half of its original volume isothermally while the gas in container B is compressed to half of its original value adiabatically. The ratio of final pressure of gas in B to that of gas in A is

Consider two containers A and B containing identical gases at the same pressure, volume and temperature. The gas in container A is compressed to half of its original volume isothermally while the gas is container B is compressed to half of its original vlue adiabatically. The ratio of final pressure of gas of B to that of gas in A is