Which of the following is NOT conserved during the combustion reaction of propane shown below? Select all that apply. C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)

moles of molecules
moles of atoms
atoms
mass
none of the above

put the answers   and i could answer.

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