Qualification > Sciences

Edexcel CHEMISTRY DOUBTS!!!!

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Igcseboy:

--- Quote from: kim on May 19, 2010, 09:10:10 am ---the answer is d
if u wanna know how ill tell ya


--- End quote ---

yes i want to ... thanxzz

Kim:

--- Quote from: Igcseboy on May 19, 2010, 09:14:42 am ---yes i want to ... thanxzz

--- End quote ---

well to calculate no of ions u need to first find no. of moles
n=m/mr=17.1/342=0.05

then u have to find the no of ions
no.of ions=0.05 x 6.02x10^23=3.01x10^22

i mole of aluminium sulphate has 2 aluminium ions and 3 sulphate ions
so as u have to find number of sulphate ions multiply the above ans by 3 and u get 9.02x10^22

Kim:
sorry u get 9.03x10^22

Igcseboy:
ok thanx aloot


cud u plzz do the 15th mcq also plzzz

Kim:

--- Quote from: Igcseboy on May 19, 2010, 09:29:20 am ---ok thanx aloot


cud u plzz do the 15th mcq also plzzz

--- End quote ---

yeh sure
the answer is A
because if ge and f were to form a compound the formula wud be gef4
as ge is in group 4 and f in group 1
and the rest all are possible

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