Question

which of the following shows the correct charge distribution in ocs? a. δ+ o = c = s δ- δ+ δ- o = c = s δ+ b. δ- o = c = s δ- δ+ c. δ+ o = c = s δ- δ+ δ- o = c = s δ+ d. b.b c.c a.a d.d question 16 how many total valence electrons are contained in hcl? d.2 a.8 c.6 b.7 question 17 how many shared electrons are there between c and n in the lewis structure of hcn? d.2 b.6 c.4 a.3

Explanation:

Question 15

Electronegativity determines charge - distribution. Oxygen is more electronegative than carbon and sulfur. So, oxygen has a partial negative ($\delta-$) charge and carbon has a partial positive ($\delta+$) charge. Sulfur is less electronegative than oxygen but more electronegative than carbon, so sulfur has a partial negative charge but less negative than oxygen. The correct charge - distribution in OCS is $\ce{O^{\delta -}=C^{\delta +}=S^{\delta -}}$.

Hydrogen (H) has 1 valence electron and chlorine (Cl) has 7 valence electrons. The total number of valence electrons in HCl is 1 + 7=8.

The Lewis - structure of HCN is $\ce{H - C\equiv N}$. There is a triple - bond between C and N. A triple - bond consists of 3 pairs of shared electrons, so there are 6 shared electrons between C and N.

Answer:

d.d

Question 16