DUE IN 15 MINS! I just wanna clarify

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

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

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?