Number of moles =

so to calculate molar mass (Molecular weight of compound):
Molecular weight =

=

= 50 g / mole
Now we calculate molecular weight of each compound in choices:
a) C₂H₄O = 44
b) CO₂ = 44
c) CH₃Cl = 50.4 ALMOST 50 so this is the correct answer
d) C₂H₆ = 30
Explanation:
Medieval number one. There you havt it.
Answer:
Ground state
the state with the smallest amount of energy.
One single covalent bond, hope this helps!
Answer : C
Because $6.65 multiplied by 4 hours equals $26.60