An unknown compound contains 14.00% copper, 31.76% carbon, 4.89% hydrogen, and the rest is oxygen. Given that the unknown compound has an empirical formula of CuC₁₂H₂₂O₁₄, and that gluconate (C₆H₁₁O₇⁻) is a common ligand for copper, determine the oxidation state of copper in the compound.

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!

If c + di is a point on the circle, then | c + di |=