40. What is the total number of moles in 80.0 grams of C2H5Cl (gram-formula mass = 64.5 grams/mole)?
Answer

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

c, liquids evaporate, creating a gas

there are two significant figures.

un recipient conține 6,4 moli de gaz. gazul hidrogen reprezintă 25% din totalul kilometrilor din container. în cazul în care presiunea totală este de 1.24 atm ceea ce este