How many moles of oxygen must be placed in a 3.00 L container to exert a pressure of 2.00 atm at 25.0°C? Which variables are given? pressure? volume? temperature? moles ?

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.

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how important do you think an instrument is to the musician who plays it?