0.64 g of copper when heated in air forms 0.80 g of copper oxide. What is the simplest formula of copper oxide?

(Ar: O= 16; Cu= 64)

The correct answer is "atomic weight".

Hope the image of the frequency formula

D. h2o + h2o > h3o + oh- confirmed.

Heat capacity = mcδtheat capacity = 2.676×10^3 j ..the heat capacity given is for 7.00 g of kcn,potassium cyanide which is equal to 0. mole of mole = mass  ÷ mr of kcn is 7  ÷ 65 =0.therefore: 0. of kcn liberates 2.676×10^3 j of heat1 mole   (2.676×10^3    ÷  0.107 )  × 1 =do the calculation to obtain 25009 j = 25kj