This is the chemical formula for nickel tetracarbonyl (a powerfully poisonous liquid used in nickel refining) Ni(CO)4 A chemical engineer has determined by measurements that there are 6.62 moles of carbon in a sample of nickel tetracarbonyl. How many moles of oxygen ar in the sample?

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.

i have no clue hope you find the answer