Calculate the percentage composition of -a) calcium chloride b] calcium nitrate
Ca = 40,01 = 35.5, N = 14,0 =16]
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Explanation:
MOLAR MASS OF CALCIUM CLORIDE IS =40.1+2*17.
PERCENTAGE COMPOSITION OF CALCIUM IS 40.1/74.1.....
PERCENTAGE OF CHLORINE IS 17/74.1
DO same with other formula of percentage composition is mass of subtance /molar mass
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Calcium Chloride have one Ca atom and 2 Chlorine Atoms
Molecular weight of Calcium Chloride (CaCl2) is:
40+35.5+35.5 = 111g/mol
a)
Mass percentage of Ca in CaCl2 is,
mass % = atomic mass of Ca/molecular weight of CaCl2 * 100
mass% = (40/111)*100
= 36.036%
Similarly,
% mass of Cl in CaCl2:
% mass = Molecular weight of Cl2/Molecular weight of CaCl2*100
= (71/111)*100
= 63.364%
b)
Calcium Nitrate Ca(NO3)2 have
1 Ca atom
2 N atoms &
6 O atoms.
Molecular weight of Calcium Nitrate is:
40+(2*14)+(6*16)
= 164g/mol
Now,
mass % of Ca in Ca(NO3)2 = Atomic Mass of Ca/Molecular weight of Calcium Nitrate*100
mass % of Ca = (40/164)*100
= 24.39%
Similarly,
mass % of N = (28/164)*100
= 17.07%
Similarly for Oxygen,
mass % of O = (96/164)*100
= 58.536%
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