The valve between a 5.00 L tank containing oxygen gas at 9.00 atm and a 7.00 L tank containing neon gas at 6.00 atm is opened. Calculate the final
pressure in the tanks assuming constant temperature.

5.80 atm
7.50 atm
7.75 atm
7.25 atm
None of the above

not clear

the atomic mass is the bottom number on the element.

-steel jelly

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.