two body systems that are affected by broken bone

Why is an elements atomic mass not listed as a whole number on the periodic table

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

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