Question

how many moles are present in 50g of oxygen atom?

Answer 1

$HELLO DEAR!!!$

Your answer is --

firstly we find the mole of CaCO3 .

molar mass of CaCO3 = 40+12+48 = 100

Now, mol of CaCO3 = 200/100 = 2mol


Now, in CaCO3 1 mol CaCO3 contains 3 mol O .

So, 2 mol CaCO3 contains 2*3 = 6 mol O

Number of atom of O = 6*6.023*10^23 = 36.138*10^23 atom



Hence, 36.138*10^23 atoms of oxygen are present in 200 g of caco3.

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Answer 2

We know the mass of 6.022×10^23 oxygen atoms which are present in 1 mole of an atom mass of 1 mole of an oxygen atom is 15.99 g/mol ≈16 g/mol

Therefore

16 g = 1 mole of oxygen

50g = (1/16)*50 =3.1250 moles

Answer: 3.125 moles

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