Answer:
A homogeneous mixture is a type of mixture in which the individual substances are evenly mixed.
Explanation:
C.
This is basically the definition of percent composition which is how much mass a element contributes to a specific molecule.
Answer:
I think its C but if its not try A then
Explanation:
A: they all have protons
b:they have a different amount of neutrons
c:protons neutrons and electrons
d: the atom itself would change
Explanation:
The given data is as follows.
Refractive index of mixture = 1.456
Refractive index of hexane = 1.375
Refractive index of toulene = 1.497
Let mole fraction of hexane =
and, mole fraction of toulene =
Also, 
or, 
Hence, calculate the mole fraction of hexane as follows.
refractive index mixture= mole fraction hexane × ref index hexane + mole fraction toluene × ref index toluene.
1.456 = 
1.456 = 
0.081 = 
= 
= 0.66
Since, 
= 1 - 0.66
= 0.34
Thus, we can conclude that mole fraction of hexane in your sample is 0.34.