Which is a general representation of a secondary amine?

Secondary amine contain a single hydrogen atom in its alpha carbon.

Explanation:

Secondary amine is also called 2° amine.Amines are named so because they contain -NH2 as functional group.

  The carbon that is adjacent to the functional group here it is -NH2 is called alpha carbon.

  If the alpha carbon of that amine comound contain a single hydrogen atom,then it is termed  as secondary amine.

  For example isopropyl amine.

RNH2

Explanation:

A primary amine is one in which the nitrogen of the amine functional group is connected to only one carbon atom. Hence there are two nitrogen atoms connected to nitrogen as shown above. This is called the general formula for primary amines and serves the purpose of a general representation for primary amines.

c is the answer because when something is left after something evaporates that shows the chemical change.

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.