Bonsoir les amis ,demain j'ai un examen de chimie en solution et je veux bien que vous m'aider à faire ce exercice s'il vous plait calculer la qantite de nacl et de l'eau nécessaire pour l'obtention de 250g solution de nacl avec le pourcentage massique 10%

The missing component to the table to the right or indicated with orange letters complete the table by filling in the corresponding numbers or symbols

Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt