Arigid 8.77l tanks contains 1.45 moles oxygen at 20°c. what is the pressure in atm?

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

What layer of the atmosphere is directly above the troposphere?

Compare and contrast refraction of light and sound will give brainliest