Apure gold bar is made of 19.55 mol of gold. what is the mass of the bar in grams

Does the energy in a solid increase or decrease when changing to a liquid?

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from