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No, it's totally irrelevant. What determines the chiral centre are four groups with different atoms or structures, not with different relative charges.Does it have to do anything with d+ and d- ...
Mole of Ca or mole of H2.and when calculating enthaply change for example in reaction : Ca(s) + 2H2O(l) = Ca(OH)2 (aq) + H2 (g) and u r given Q, which moles do u take from Ca or H2O ?? Thanks so much
In fact, the equation must first be stoichiometrically balanced (balanced to smallest possible integers), and then calculate the resultant enthalpy change. For example, A and B react to from C and D. Even if the balanced equation is 9A + 11B = 12C + 10D, it is still balanced to smallest integers. Enthalpy change (per mole) is still the total change according to this equation.
So the enthalpy change is more like the change "per balanced equation".