Solid calcium combines with oxygen gas to form solid calcium oxide. write a balanced equation and how many moles of calcium oxide would be produce if only 0.33 moles of oxygen were available?

2Ca + O2 -> 2CaO

0.66 mol CaO

Explanation:

0.33 mol O2(2 mol CaO/1 mol O2) = 0.66 mol CaO

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.

the objects have the same charge is correct.

nathan lee