What is the mass of the ethanol that exactly fills a 200.0 mL container? The density of ethanol is 0.8 g/mL. please help

Air can be considered a mixture. which statement does not explain why?

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

Which of these statements best explains why space exploration should be encouraged? it prepares humans to live without oxygen. it dispel myths about objects in space. it prevents comets and asteroids from striking earth. it creates technology to absorb harmful radiations in space.