Why can you write u (internal energy) as a function of two thermodynamic properties and not all three (p, v, t)? why is the state fully specified by specifying only two properties? what is the internal energy state 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