A compound is 40.0 % carbon, 6.66% hydrogen, and 53.3 % oxygen. The
sample is also found to have a molecular weight of 60 g/mol. What is the
molecular formula of this compound? *

C202H4

COH

C202H2

COH2

Asample of silver (with work function ? = 4.52 ev) is exposed to an ultraviolet light source (? = 200 nm), which results in the ejection of photoelectrons. what changes will be observed if: silver is replaced with copper (? = 5.10 ev) more photoelectrons ejected no photoelectrons are emitted fewer photoelectrons ejected more energetic photoelectrons (on average) less energetic photoelectrons (on average)

What is avogadro’s number, and why is it useful

In a water molecule, hydrogen and oxygen are held together by a(an) bond. a) double covalent b) ionic c) nonpolar covalent d) hydrogen e) polar covalent