A balloon containing helium at constant pressure and temperature has the volume doubled by adding a more helium.Which statement(s)is(are)TRUE?

Question

Quizplus · Accepted Answer

Since the volume of the balloon doubled at constant pressure and temperature by adding more helium, the number of helium atoms, the number of moles of helium, and the mass of helium in the balloon all doubled. This is in accordance with Avogadro's law, which states that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules. Therefore, doubling the volume while keeping temperature and pressure constant means doubling the amount of substance (in moles), which also means the mass and the number of atoms are doubled.

A Balloon Containing Helium at Constant Pressure and Temperature Has