A sample of Ac-255 originally contained 8.0g. After 720 hours, how much of the original Ac-255 remains? The half-life of the isotope is 10 days. I will mark the Brainiest if your answer is correct.

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Achemist wants to extract copper metal from copper chloride solution. the chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (ii) chloride. a single replacement reaction takes place. (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction? a) approximately 0.36 grams, because copper (ii) chloride acts as a limiting reactant b) approximately 1.8 grams, because copper (ii) chloride acts as a limiting reactant c) approximately 0.36 grams, because aluminum acts as a limiting reactant d) approximately 1.8 grams, because aluminum acts as a limiting reactant

How many moles are in 43.9 l of oxygen