Recent content by harman90

18.4 moles Thanks.

Alright ... SO 98gm H2SO4 in 100gm solution. 100 gm solution = 54.3 ml. Weight of Sulphuric acid is = 98/54.3 * 1000 = 1804.8 gm

I think I got it ? If I only consider Density : 1 litres contain 1840 gm , Now this 1840gm will be of weight of (Sulphuric acid + water) ?

Moles in Litre Solution

Molarity Well it is simple derivation, By considering mass of solution = 100gm and H2SO4 = 98gm then they converted Mass of solution into VOLUME. and converted mass of H2SO4 into moles. Once you have both of them, you can get molarity. NOW my confusion is ... Why didnt they simply converted...

Sorry I didnt get what you are implying. Here is another way to Present my Doubt. We say that Molarity of Pure water is 55.5 ( which we calculate by using Density as 1) Now By giving mass percentage, What extra information is given ? SECOND: what is difference between STRENGTH of soln. and...

Thank you guys for your reply. Formula is MOLARITY = (%age * density *10)/ Density

Sorry ! Corrected. It was missing decimal.

Thank you very much ... It makes sense now.

There are two numericals, 1. Density of Methanol is 0.793 kg/l. Find molarity. ANSWER is : Desity/ Molar mass = Molarity (UNDERSTANDABLE) In other numerical 2. Concentration of H2SO4 is 98% by mass having density of 1.84gm/ml. Calculate Molarity. here they used another formula. now my...

2nd Ionization enthalpy... is actually removing electron from the ION. infact all the successive Ionization energies are for Removing electrons from Ions.

So it means , In case anions, IE is negative ? I can't find any link favouring that statement ? Can you give me any source ?

Thank you for reply. Well, it is well known fact that Ionization energy (second case) is always positive I.e Energy is required to Remove the electron. (electron gain enthalpy can be negative or positive, but Ionization enthalpy is always positive)

sorry My question is : (leaving the sign conventions aside) If energy is Required to add the electron to gaseous atom (Electron affinity) Then why further energy is required to Remove it? ( infact it should release the energy)

I am confused about Ionization and electron affinity concept If energy is Required to add the electron to gaseous atom (Electron affinity - in case of noble gases) Then why further energy is required to Remove it? (Ionization energy) isnt this violation of Conservation of energy?