A rigid 5.00 L cylinder contains 28.0 g of O2(g) and 38.5 g of CO2(g) (a) Calculate the total pressure, in atm, of the gas mixture in the cylinder at 298 K.
(b) The temperature of the gas mixture in the cylinder is decreased to 280 K Calculate each of the following.
(i) The mole fraction of O2(g) in the cylinder
(ii) The partial pressure, in atm, of O2(g) in the cylinder

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.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.