Reacționează 40g HCl de concentrație 36,5% cu 20g soluție hidroxid de calciu de concentrație 37%(Se dau masele atomice H=1;Cl=35,5;Ca=40;O=16).Substanța în exces este:

The size (radius) of an oxygen molecule is about 2.0 ×10−10m. make a rough estimate of the pressure at which the finite volume of the molecules should cause noticeable deviations from ideal-gas behavior at ordinary temperatures (t= 300k ). assume that deviatons would be noticeable when volume of the gas per molecule equals the volume of the molecule itself.