b the awnser is b its a compound of carbon C and 2 oxygon atoms O sub 2
40 watts because 120-80 is forty or 80 + 40 - 120
I think 3 of them are its been 1 half years since ive done this i dont take chemistry anymore
Explanation:
83,000 is 8.3x10^4 in standard form
when it's a positive move decimal to the right as many as exponent say
if it's negative move decimal to left and and zeros till you move what exponent says
