Copper oxide, CuO, is a black solid. It doesn’t look at all likethe element copper. What color flame would it produce?

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .

56 moles of   lieter in chemistry

explanation: