conversión del vapor de agua en lluvia, es un cambio físico o cambio químico y por qué / conversion of water vapor into rain, is it a physical change or chemical change and why​

Achildren’s pain relief elixir contains 80. mg acetaminophen per 0.50 teaspoon. the dosage recommended for a child who weighs between 24 and 35 lb is 1.5 teaspoons. what is the range of acetaminophen doses, expressed in mg acetaminophen/kg body weight, for children who weigh between 24 and 35 lb