draw the structure of the conjugated diene that will react with one equivalent of hbr to yield a racemic mixture of 3-bromocyclohexene.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l