2.86 f. u. MgO equals how many moles of MgO

If a 20.0ml test tube measures 15.0cm, what is the length in meters?

Describe two techniques used to measure the ph of a solution

Why does an evaporating liquid cool down according to the kinetic molecular theory? heat is required to evaporate a liquid. heat is lost through elastic collisions. the highest velocity molecules are lost. heat must be dissipated to break the liquid bonds.