The stratosphere is cold except in its upper regions where is located. Oxygen

ozone

space

Nitrogen

How many moles of potassium are needed to react completely with 12.8 moles of magnessium bromide?

How many moles are in 7.2 x 10^23 carbon molecules?

An object of mass 10.0 kg and volume 1000 ml and density 10 g/ml sinks in water who’s density is 1.0 g/ml. what is the mass of the water which has been displaced in kilograms