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10g of CaCO3 is equal to a.10 mole of CaCO3 b.1 gram atom of Ca c.6 x 10^26 atoms of...

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madmoni06 | Student | (Level 1) Honors

Posted April 9, 2013 at 2:45 PM via web

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10g of CaCO3 is equal to

a.10 mole of CaCO3

b.1 gram atom of Ca

c.6 x 10^26 atoms of Ca

d.10^-3 mole of CaCO3

 

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jeew-m | College Teacher | (Level 1) Educator Emeritus

Posted April 9, 2013 at 3:28 PM (Answer #1)

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`CaCO_3` molar mass = 100g/mol

 

Moles in 10g of `CaCO_3 = 10/100 = 0.1 mol`

 

Atoms in 1 mol of `CaCO_3 = 6.022xx10^23`

Atoms in 0.1 mol `CaCO_3 = 0.1xx6.022xx10^23 = 6.022xx10^22`

We have similar amount of Ca and C atoms.

 

Amount of Ca moles in 10g of `CaCO_3 = 0.1`

Mass of carbon in 0.1mol of `CaCO_3 = 40xx0.1 = 4g`

 

Non of the answers are correct.

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