Question

calculate the number of molecules in 9 g of co2

Answer 1

Molar mass of Co2 = 12+2(16) = 12+32 = 44 g/mol

Number of moles present in 9 g of Co2 =
$\frac{9}{44} = 0.245 \: mol$
Number of molecules of Co2 = Number of moles of Co2 × Avogadro's number

= 0.245×6.022×10^23 molecules.

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Answer 2

Molar mass of Co2 = 44 g/mol [ 12 + 32 ]

Number of moles in 9 g of Co2 are $</p><p> \frac{9}{44} = 0.245 \: mol$

Number of molecules of Co2 = moles × Avogadro's number

[Tex]= 0.245*6.022*10{}^{23} molecules[/tex]

[Tex]1.47539 * 10{}^{23} [/tex]

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