Boys I need help look at the screenshot and answer please

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

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

Which substance can be broken down by chemical means