Calculate number of moles in the given number of molecules.
Formaldehyde is used to preserve dead animals. Its molecular formula is CH2O. Calculate the number of moles that would contain 3.011 x 1023 molecules of this compound.
Difficulty: Medium
Problem Solving Strategy: Remember that 1 mole of any compound contains 6.022 x 1023 molecules.
Thus
6.022 x 1023 molecules = 1 mole of compound
Solution:
6.022 x 1023 molecules = 1 mole of formaldehyde
1 molecule = $\frac{1}{6.022 \times 10^{23}}$ moles of formaldehyde
3.011 x 1023 molecules = $\frac{1}{6.022 \times 10^{23}} \times 3.011 \times 10^{23}$ moles of formaldehyde
3.011 x 1023 molecules = 0.05 moles of formaldehyde
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