I believe this question has five choices available:
>an SN2 process has happened with reversal of configuration
>racemization followed by an S N 2 reaction
>an SN1 process has occurred resulting in reversal of configuration
>an SN1 reaction has taken place due to the formation of a carbocation
>an SN1 event followed by an S N 2 “backside” attack
The correct choice is:
an SN1 reaction has occurred due to carbocation formation
Step

: To find the mass of a single washer, divide the total measured mass by the number of washers

. Step

: Convert kilograms to milligrams knowing

; thus

resulting in the final answer

.