What is the molar mass of a gas with a density of at STP?

A gas is at STP

What does STP refer to?

At the vapor pressure of pure water is . What is the minimum amount of liquid water we need to put in a flask to achieve this vapor pressure.

of are introduced in a flask. A vacuum is applied to the flask and its temperature raised to . At this temperature ammonium nitrate decomposes according to the reaction:

If the percent yield of this reaction is , which will be the total pressure of the flask after the reaction concludes.

COCl2 (g) ⇌ CO (g) + Cl2 (g)

Initially a reaction chamber contains only 2 moles of COCl2, after the reaction has reached the equilibrium shown above the pressure is measures to be 2.60 atm. What is the most likely cause for the increase in pressure?

Which of the following will not be found in the atmosphere for an extended period of time?

A flexible box contains four moles of octane gas at STP with an excess of oxygen. If the octane is combusted according to the following reaction and the box is allowed to expand, what is the change in volume?

What is the osmotic pressure exerted by a solution of 2M CaCl2 at room temperature? (R=0.082 L*atm/K/mol)

It can be argued that one of the greatest innovations in automobile safety is the airbag. A typical driver's side airbag expands to a volume of between 50-60L. For this problem use . In older airbag models sodium azide is employed to produce nitrogen gas as shown in the following decomposition reaction:

Two more reactions are employed to remove the reactive sodium metal, shift the above reaction equilibrium to the right, and produce more nitrogen gas; however for this problem assume all gas is generated from the first reaction as shown above and that the reaction proceeds to completion.

The gauge pressure is . This is the pressure at which the airbag is deployed. Note: gauge pressure is defined as the additional pressure in the system relative to atmospheric pressure. In this case use STP pressure as atmospheric pressure.

(It is worth noting that this pressure is the initial pressure to fill the airbag, which would provide a rock-hard cushion; therefore in the real world the air bag immediately begins to deflate so as to provide proper cushioning; that fact is not important for solving this problem).

What is the minimum mass of required to inflate the airbag given the above conditions?

Suppose that a container contains of a gaseous sample of unknown hydrocarbon at STP. If this sample occupies a volume of , what is the identity of the hydrocarbon?