Explanation:
More is the mass of an alkane molecule more will be its boiling point. This means that forces of attraction will be more when mass is more as more heat is required to break the bonds within atoms. Hence, boiling point is more.
Therefore, in the given molecules mass of 
is 16.04 g/mol, mass of 
is 44 g/mol, and mass of 
is 30 g/mol.
Thus, we can see that has the highest mass and has least mass.
Hence, increasing strength of intermolecular forces of given compounds is as follows.
Answer: flame in a lamp, tube light, electric bulb
Explanation:
Answer: they like deep water
Explanation: they do
Answer:
Wt. Avg. Atomic Weight => 63.35457 amu
Explanation:
Given Isotopic %Abundance fractional Wt Avg
At. Mass (amu) abundance contribution
Cu-63 62.93 69.09 0.6909 43.4783
Cu-65 64.9278 20.0668 0.200668 20.0668
Wt Average of all isotopes = ∑Wt Avg Contributions
= 43.4783 amu + 20.0668 amu = 63.35457 amu
