Question

Which of the following is a correctly balanced equation?
A.
2Cu + O2 --> 2CuO

B.
Mg + O2 --> MgO2

C.
3KCl + HNO3 --> 3HCl + KNO3

D.
CaCO3 --> CaO + CO3

Answer 1

@sleepyjess

Answer 2

@Hero @tkhunny

Answer 3

Why do we get no work shown when we are tagged. SHOW YOUR WORK. You can't have nothing.

This is an addition problem. Did you lose or gain any molecules at the "-->"?

Answer 4

You will also need to try harder in the notation. Subscripts are important.

Answer 5

okay actually nvm I figured it out! Thank you for the advice though!