What's the question I don't get it?
Au is the symbol for gold. It comes from Latin word for gold, which is Aurunum. Its atomic number is 79.
Partial pressure O2 = total pressure - vapour pressure H2O at 50 deg C
Vapour pressure H2O at 50 deg C = 12.332 kPa
= 96.00 kPa - 12.332 kPa = 83.67 kPa
If they're different sizes and densities, you are able to separate the substances.
Krypton is in group 18, and so it has 8 valence electrons. B is the answer
