How many moles of gas does it take to occupy 120 liters at STP?

Use examples from the article to explain one positive and one negative effect that chemistry has had on society

One or more substances changing into one or more substances is an example of a

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms