Number of hybridised orbitals, which form non-bonding molecular orbitals in H2O, BF3 and NH3 molecules respectively, are:​

Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i