If the pressure remains constant and the temperature of gas G is raised to 273 degree Celsius, the mass of the sample decreases, increases, or remains the same?
If more molecules of gas G are added to the system at constant temperature and pressure, the volume of the system decreases, increases or remains the same?
If more molecules of gas G are added to the system at constant temperature and pressure, the volume of the system decreases, increases or remains the same?
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The gas properties which are of main interest, are the pressure, temperature and volume. The mass of the gas remains same. When you increase the temperature of the gas, at constant pressure, the volume of the gas expands but the mass remains same. So, its obvious, that the density of the gas decreases. Mass plays no role in this case. But, if at constant pressure and temperature, you are adding more molecules to the gas, then the mass increases as there is addition of molecular mass.
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a)....Remains the same.
b)...Increases.
b)...Increases.