10)
1 moles of Mg(ClO3)2 has 6 atoms of oxygen.
So, number of Mg(ClO3)2 = number of O / 6
= (6.0*10^26) / 6
= 1.0*10^26
use:
number of mol = number of molecules / Avogadro’s number
number of mol = 1*10^26 / 6.022*10^23 mol
number of mol = 1.661*10^2 mol
Molar mass of Mg(ClO3)2,
MM = 1*MM(Mg) + 2*MM(Cl) + 6*MM(O)
= 1*24.31 + 2*35.45 + 6*16.0
= 191.21 g/mol
use:
mass of Mg(ClO3)2,
m = number of mol * molar mass
= 1.661*10^2 mol * 1.912*10^2 g/mol
= 3.175*10^4 g
Answer: A
Only 1 question at a time please
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