This blog will cover and explain the specification for Edexcel triple science course 2013 Chemistry. Hope it helps :)
I just noticed, it's 96500, not 95600
Oops :/ Thanks for pointing it out!
I thought it was 96,000??
whatever it is,its value will be given in the question.
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E.G (question 5 from paper 2C May 2012. KCHO/2C)Calculate the quantity of electricity, in coulombs, needed to produce 18 cm3 of chlorine gas. *( 1 Faraday= 96500 coulombs)Okay. LET'S DO IT. I'll do every single step (:~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~1) First we must find the number of moles in the 18 cm3 of chlorine gas. V=nmv ( volume= moles x molar volume) 18cm3 = moles x 24000cm3 <--- same units!!rearrange it to get moles. 18cm3/ 24000cm3 = moles = 0.000752) Write down the half equation. 2Cl' > Cl2 + 2e' 3) Electricity always refers to "flow of electrons"2e' ( 2 electrons) are need to produce chlorine gas.2 electrons= 96500 x 22 e'= 193000 C4) BUT what about the moles? just you wait... now times the number of coulombs by the amount of moles calculated in part 1)193000 x 0.00075= 144.75 Coulombs are need to produce 18 cm3 of chlorine gas.AND all done!! hope you understood and this helped (: