Answer:
Halogens
Explanation:
Electronegativity increases from <em>left to right</em> in the Periodic Table (see image).
We ignore the elements of Group 18 (the noble gases) because they are quite unreactive.
So, the most electronegative elements are those in Group 17 (the <em>halogens</em>).
Answer:
Partial pressure of methane: 1.18 atm
Partial pressure of ethane: 1.45 atm
Partial pressure of propane: 2.35 atm
Explanation:
Let the total moles of gases in a container be n.
Total pressure of the gases in a container =P = 5.0 atm
Temperature of the gases in a container =T = 23°C = 296.15 K
Volume of the container = V = 10.0 L
(Ideal gas equation)

Moles of methane gas =
Moles of ethane gas =
Moles of propane gas =


Partial pressure of all the gases can be calculated by using Raoult's law:

= partial pressure of 'i' component.
= mole fraction of 'i' component in mixture
P = total pressure of the mixture
Partial pressure of methane:


Partial pressure of ethane:


Partial pressure of propane:


Using the Fundamental Equation of Calorimetry, we have:
If you notice any mistake with my english, please know me, because I am not native.
It will be the second one
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