Answer these questions based on the Periodic Table entry for sodium: 11
Na
22.991
What is the atomic mass?
What is the atomic number?
How many neutrons does sodium have?
What is the chemical symbol for sodium?
How many protons does sodium have?
How many electrons does it have in the n=2 orbit?

This is the star at the center of the solar system around which the earth and other matter orbit

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

What is the value of keq for the reaction expressed in scientific notation