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calculeaza masa pentru
a)0,25 moli clorura calciu
b)7,5 kmoli de carbonat de calciu
c)9,033,10 la puterea 19 molecule de clor
va rog


Răspuns :

a) MCaCl2= ACa+2ACl=40+2*35,5=111g/mol

n=m/M=>m=n*M=0,25*111=27,75g CaCl2

b) MCaCO3=100kg/kmol

m=n*M=7,5*100=750kg CaCO3

c) 1 mol Cl2....................6,022*10^23 molecule Cl2
x....................................0,0009033*10^23 molecule Cl2

x=0,0009033/6,022=0,00015 moli Cl2

m=n*M=0,00015 * 71=0,01065g Cl2