What is the mole fraction of h2s in the gas mixture of gases made up of 7.0 g of h2s, 10.0 g of ch4 and 12.0 g of o2

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.

може ли да зареждате повече информация, моля