Use the following two charts to identify AT LEAST 2 similarities amongst all the common acids

Just like in your other question... there seems to be (aq) solutions mixed in with each of the formulas. It looks like there is enthalpy (also known as delta h) is in each formula... If you dont know what that is, its basically a type of energy.

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.

12 is it do you think so