a compound has a molecular mass of 286grams and has the following composition by mass sodium 16.1%,carbon 4.2%,oxygen10.3% and x% of water crystallization .. find its empirical formula and molecular formula

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.

level 4 to level 2 : ))

the correct answer would be b) volume versus temperature, because they are also directly proportional.