Znse Zinc

Help with Chemistry!!!!!!!?

Hi,

On one of my questions it says Copper and Oxygen.

You have to write their name like zinc selenite and their chemical formula like ZnSe.

But heres the problem, Copper has +1 and +2 so which charge while i choose and why?

Plz explan thouroughly because i have to understand my homework too ranther than just copy now.

Well it should tell you which copper to use cuz it could be either
However Copper is usually +2

but i guess since it doesnt specify you should write down both
OR maybe the question is asking you to write A formula of copper and oxygen, so either one would be fine in that case

Copper (II) Oxide would be CuO
Copper (I) Oxide would be Cu2O

Hope it helped!

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Zinc selenide (ZnSe) crystallizes in the zinc blende (ZnS) structure and has a density of 5.42 g/cm3.?

1. How many Zn2+ ions are in each unit cell? = 4
2. How many Se2- ions are in each unit cell? = 4
3. What is the mass of a unit cell?
4. What is the volume of a unit cell?
5. What is the edge length of a unit cell?

3. Zn = 65.39 g/mol
Se = 78.96 g/mol
4(Zn) + 4(Se) = 577.4 amu (g/mol)

4. density = 5.42 g/cm^3 577.4/6.022e23 = 9.588e-22g
(9.588e-22g)/(5.42 g/cm^2) = 1.769e-22 cm^3

5. (1.769e-22 cm^3)^1/3 = 5.61365e-8 cm