Question

What is the number of formula units in a 8.64 mol sample of Ca2O?

What is the number of formula units in a 8.64 mol sample of Ca2O?
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Answer #1

Ca2O does not exist. Calcium oxide is CaO (calcium in +2 state and Oxygen is in -2 state).

According to Avagadro's number 1 mole of any substance is equal to 6.022 x 1023 atoms,molecules, formula units, ions and particles etc.

1 mole of CaO = 6.022 x 1023 formula units

8.64 mol sample of CaO = 8.64 mol x 6.022 x 1023/mol formula units

= 5.203 x 1024 formula units.

Answer: the number of formula units in a 8.64 mol sample of CaO = 5.203 x 1024 formula units.

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