A balloon with an initial volume of 4.5L of air was at a pressure of 0.75 atm and a temperature of 300K. How many moles of air molecules are in the container?

What is the molar mass of a gas that has density of 2.054 g/l

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

The arrangement of particles is most ordered in a sample of