Ya, it pretty much means there is no change in enthalpy when a pure element (in standard state) is formed. And by definition the standard heat of formation of a substance has to be measured for the reaction where the substance is formed by its constituent elements in their standard states...
Well, if you're looking for a textbook I'm using "Chemistry" Fifth Edition by McMurray & Fay. It's good but it'll probably set you back $200 Canadian new.
Some molecules have polar bonds but that does not necessarily mean that the molecule is polar. The polarity of the molecule depends on the net pull of electrons (electronegativity) within the molecule. If the electronegativities of the peripheral bonds are equal and the bond lengths between the...
Free energy is essentially the ability to do work. A reaction where free energy is absorbed from the environment has work being done on the reactants (this is endergonic, delta G is positive). When free energy is release by a reaction, the reactants have done work on the environment (this is...
Correct me if I'm wrong but...
I think you can assume you have a solution 1L in volume. If 1% of that solution is sulfuric acid, you can find the molar concentration. Sulfuric acid is a strong acid so assume 100% dissociation of H+. Then just use the formula pH = -log([H+]) to get the pH.