Someone check my answers asap please, will give brainliest!! Find oxidation and reduction half-reactions to this equation

Oxidation: K (s) --> K+ (aq) + e
Reduction: Cu2+ + 2e --> Cu (s)

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ