Answer:The correct order is:
ethane, pentane, heptane, octane
Explanation:
The boiling point of the alkanes increases with increase with an molecular mass that is higher the number of carbon atoms in the alkane higher will be the boiling point of the alkane.
With increase in molecular area the surface area and association of an alkane also increases.
Ethane = , 2 carbon atoms.
Pentane =,5 carbon atoms.
Heptane = ,7 carbon atoms.
Octane =,8 carbon atoms.
Straight-chain alkanes from lowest to highest boiling point:
ethane<pentane<heptane< octane
Answer: ethane, pentane, heptane, octane
Explanation: Boiling point is the temperature at which vapor pressure of the liquid becomes equal to atmospheric pressure.
Boiling point depends on the strength of inter molecular forces. The molecules of hydrocarbons are bonded through weak vanderwaal's forces. As the length of carbon chain increases, the surface area increases and thus the vanderwaal forces increases, thus more heat is to be supplied to break the bonds and thus there is an increase in the boiling point.
Answer:
Z=22.70
Explanation:
It is given that,
An element Z that has two naturally occurring isotopes with the following percent abundances as follows :
The isotope with a mass number 22 is 65.0% abundant; the isotope with a mass number 24 is 35.0% abundant.
The average atomic mass for element Z is given by :
So, the average atomic mass for element Z is 22.70.