A certain first-order reaction a → b is 25% complete in 42 min at 25°c. What is the half-life of the reaction?.

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Mount saint helen the great lakes and death valley are physical features of the earth which scientific term describes these features

Healing after the death of a loved one is most difficult when: a) the bereaved is not allowed to mourn in the way he or she wishes b) the death is a long, protracted one c.) a period of grief has already elapsed d) no other mourners are present