How many molecules of H2O2 are present in 68 gram of H2O2?

Molecules of H2O2 in 68g of H2O2

To find the number of molecules in a given mass of a substance, you can use the formula:

Number of moles=Mass/ Molar mass

First, find the molar mass of H2​O2​, which consists of two hydrogen atoms (H) and two oxygen atoms (O).

Molar mass of H=1.008 g/mol

Molar mass of O=16.00 g/mol

Molar mass of H2O2= 2×(Molar mass of H)+2×(Molar mass of O)

=2×[1.008] + 2×[16.00 g/mol]

=2.016+32.00 g/mol

=34.016 g/mol Molar mass of H2​O2​​

Now, use the formula to find the number of moles:

Number of moles=Mass / Molar mass

=68 g / 34.016 g/mol

Calculate the number of moles and then use Avogadro’s number (6.022×10236.022×1023 molecules/mol) to find the number of molecules:

Number of molecules=Number of moles×(6.022×1023 molecules/mol)

Find the number of moles:

Number of moles=Mass/Molar mass

=68 g / 34.016 g/mol

Number of moles≈2 moles

Use Avogadro’s number (6.022×10^23 molecules/mol) to find the number of molecules: Number of molecules=Number of moles×(6.022×10^23 molecules/mol)

Number of molecules≈2 moles×(6.022×10^23 molecules/mol)

Number of molecules≈1.204×10^24 molecules

Therefore, there are approximately 1.204×10^24 or 12.04×10^23 molecules of H2​O2​ in 68 grams of H2​O2​.

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