Answer:
39.099 amu
Explanation:
saw this on quizlet no cap sorry im 3 weeks late
<span>Sublimation: the substance changes directly from a solid to a gas without going through the liquid phase. Deposition: the substance changes directly from a gas to a solid without going through the liquid phase.</span>
Explanation:
Formula to calculate refractive index of n is as follows.
n = 
where, 
= mole fraction of A
= mole fraction of B
= refractive index of A
= refractive index of B
Hence, putting the given values into the above formula as follows.
n =
1.5248 = 
........ (1)
Also, it is known that 
= 1
and, 
......... (2)
Now, put equation (2) in equation (1) as follows.
1.5248 = 
1.5248 = 
= 0.467
And, the value of is calculated as follows.
= 
= 0.533
Hence, mole percentage of A will be calculated as follows.
Mole % of A = 
= 
= 46.7%
Thus, we can conclude that the mole percent of A in their mixture is 46.7%.
Answer:
1 mole of Helium is answer
Five points of Dalton's atomic theory:
1) all elements are made up of atoms.
<span>2) atoms are so small that they cannot be divided any further. </span>
<span>3) an atom can neither be destroyed nor be formed. </span>
<span>4) atoms of an element are similar, they posses same mass and same properties. </span>
<span>5) atoms of different elements combine in a definite ratio to form compounds. </span>
<span>
</span><span>Due to further experimentation it was concluded that atom is made up of small particles identified as proton, neutrons, and electrons. They can be further subdivided.
Another change is the presence of isotopes of atoms of different elements. Hence, atoms of the same element can also have different masses. </span>
