Answer:
there are two types of nomenclature used in organic system. the most widely used and universally accepted system of nomenclature is the IUPAC system of nomenclature. some compounds are referred to by their common name that existed before the IUPAC system or is more widely known than the IUPAC names.
Explanation:
IUPAC ( international union of pure and applied chemistry) system of nomenclature is used to name compounds in organic system. there are some principles to be followed while using this nomenclature. some of them are:-
1) identification of parent chain is the first step. the longest hydrocarbon chain is the parent chain.
2) identification of all the substituent groups of the parent chain is also required.
3) hydrocarbon cyclic ring has a fixed prefix and that is cyclo.
Answer: The molar concentration of oxygen gas in water is 
.
Explanation:
Partial pressure of the 
gas = 685 torr = 0.8905 bar
1 torr = 0.0013 bar
According Henry's law:
Value of Henry's constant of oxygen gas at 20 °C in water = 34860 bar
Let the number of moles of gas in 1 liter water be n.
1 Liter water = 1000 g of water
Moles of water in 1 L 
Molar concentration of oxygen gas in 1 L of water:
The molar concentration of oxygen gas in water is .
An exothermic process is one that gives off heat.
Explanation:
This heat is transferred to the surroundings. An endothermic process is one in which heat has to be supplied to the system from the surroundings.
The noble gases AKA the column with full outermost valence shells. (Group 18)
