250 ml of a salt solution with a concentration of 15.0 g/l is mixed with 220 ml of a salt solution containing 6.0% salt (m/v). what is the final concentration of salt in the solution in g/l?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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 is true according to the law of conservation of energy