ASAP PLZ HELP Determine the number of moles contained in 1.35x10^28 molecules of oxygen gas (O2).

please don't put a link as an answer!!!

Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water? a. strong acid b. strong base c. weak acid d. weak base

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true