C or A. I can’t decide tho. I know most def it’s gotta be one of them two.
I don't know much about this, but probably the reason why your teacher circled 300k is because of what's in the photo below. If you couldn't tell from the photo, its because 300k isn't negative. Anyway this is my guess, based on my limited knowledge.
Answer:
It would be around 4.4 in PH
Explanation:
I hope this helped.
Answer:
Explanation:
Hello!
In this case, according to the law of conservation of mass, it is possible to realize that the mass of oxygen comes from the subtraction of the total mass and the mass of copper:
Next, we compute the moles of both Cu and O given their atomic masses:
Now, we divide by the moles of oxygen as the fewest ones, in order to calculate their subscripts in the empirical formula:
Therefore, the empirical formula turns out to be:
Best regards!