What is percent by mass of water in sodium bicarbonate octahydrate?

This is the partial pressure of Ar in the flask. A 1.00 L flask is filled with 1.20g of argon at 25 degrees C. A sample of ethane vapor is added to the same flask until the total pressure is 1.400atm .

Explanation:

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

gold is my favorite solid.