Question

6.4g of oxygen will contain ______ number of oxygen molecule
a. 6.023×10^23
b. 6.023×10^22
c. 1.2046×10^23
d.1.2046×10^22
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&give complete explanation
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Answer 1

according to Avagadro any mole of element consists of 6.23×10^23

Answer 2

6.4g of Oxygen (O2) will contain 1.2046x10^23 Molecules

Molar mass of Oxygen = 32g/mol

Moles in 6.4g of Oxygen= 6.4g/32 = 0.2 moles

Molecules in 0.2 mole of oxygen = 0.2 x 6.022 x 10^23 = 1.2046 x 10^23 Molecules

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