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To calculate the number of molecules in a substance, we need to know the mass of the substance and its molar mass, and use the Avogadro's number.
The molar mass of C4H8O2 can be calculated by adding the atomic masses of all the atoms in the molecule. The atomic masses of C, H, and O are approximately 12, 1, and 16 respectively. So,
Molar mass of C4H8O2 = (4 × 12.01 g/mol) + (8 × 1.01 g/mol) + (2 × 16.00 g/mol)
= 72.10 g/mol
Now, we can use the following formula to calculate the number of molecules in 38.8 g of C4H8O2:
Number of molecules = (mass of substance / molar mass) x Avogadro's number
where Avogadro's number is approximately 6.022 × 10^23 molecules per mole.
Substituting the values, we get:
Number of molecules = (38.8 g / 72.10 g/mol) x (6.022 × 10^23 molecules/mol)
= 1.03 × 10^23 molecules
Therefore, there are approximately 1.03 × 10^23 molecules in 38.8 g of C4H8O2.
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