Question

Mass of 12.044 × 10 raise to the power 25 molecules of oxygen. Calculate.

Answer 1

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Answer 2

Mass of $12.044\times10^{25}$ molecules of oxygen is $3.2\times10^3 g$.

Given:

Number of molecules of oxygen = $12.044\times10^{25}$

To find:

Mass of $12.044\times10^{25}$ molecules of oxygen = ?

Formula to be used:

• Molecules to moles:

Moles = $\frac{Numeber of molecules}{Avogadro number}$

• Mass

Mass = Moles × Atomic weight

Calculation:

Conversion of molecules to moles:

Moles = $\frac{Numeber of molecules}{Avogadro number}$

Moles = $\frac{1.2044\times10^{26}}{6.022\times10^{23}}$

Moles = $0.2\times10^3$

Mass calculation:

Mass = Moles × Atomic weight

(Atomic weight of oxygen is 16)

Mass = $0.2\times10^3$ × 16

Mass = $3.2\times10^3$

Conclusion:

Thus the mass of $12.044\times10^{25}$ molecules of oxygen is calculated as  $3.2\times10^3 g$.

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