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A mixture of gases containing 21.0 g of N2, 106.5 g of Cl2, and 12.0 g of He at 21°C is in a 8.00-L container. What is the partial pressure of He? (10pts)

What is the value of a quadruple-dotted quarter note? (Assume the quarter note is 1 beat) Formula needed:  

How many valence electrons does the Fe3+ cation have?  

This former president tried and failed at a peace effort in Feb. 1861

The John Brown Raid took place in

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Al(C2H3O2)3 and LiNO3 are mixed.

The first period of “Reconstruction” was

We can use Ered and Eox values to determine whether a complex redox reaction will go spontaneously, even if the reaction is not setup as part of a voltaic cell. Is the following complex redox reaction spontaneous or not, i.e, will it “go” as written? You don’t need to understand the details of the reaction to solve this problem, you just need to know how to determine Ecell. 4 Ag(s)  +  O2(g)  +  4H+(aq)   →   4 Ag+(aq)  +  2 H2O(l) Use the following half reaction reduction potential data to calculate Ecell to answer this question. This time you will need to obtained Eox by reversing one of the Ered. O2(g)  +  4H+(aq)  +  4e-   →  2 H2O(l)         Ered = +1.23 V 4 Ag+(aq)  +  4e-     →  4 Ag(s)                      Ered = +0.80 V Note that the equation ignores the fact that in water H+ is really H3O+

How many neutrons does the 13C isotope (carbon-13) of carbon have?  

Electron waves are what are called standing waves. Standing waves have a specific property that not just any wave is allowed. This is why only certain atomic orbital with specific energies are allowed to exist in an atom. The vibrations of a guitar string are also standing waves, only certain waves are allowed. In the diagram below, one of the waves is not allowed, if it were an atomic orbital, it would not exist, Which is it?