Answer :

Moles can be calculated if the given substance’s mass is known and it can be expressed as follows:mole = mass of substance / molar mass of substance.

Molar mass of benzene (C6H6) is obtained by adding the atomic masses of all its constituent atoms and can be calculated as follows:

Molar mass of benzene (C6H6) = (6 × atomic mass of carbon) + (6 × atomic mass of hydrogen)= (6 × 12.01) + (6 × 1.01)= 72.06 + 6.06= 78.12 g/mol

Now, we can calculate the number of moles of benzene present in 390 g of benzene as follows:

moles of benzene = mass of benzene / molar mass of benzene= 390 / 78.12= 4.998 mol.

Therefore, the answer is option (a) 5 mol.

The given problem asks us to find the number of moles of benzene in 390 g of benzene. Moles can be calculated if the given substance’s mass is known.The molar mass of benzene (C6H6) is obtained by adding the atomic masses of all its constituent atoms.

The atomic mass of carbon is 12.01 g/mol, and the atomic mass of hydrogen is 1.01 g/mol, so the molar mass of benzene can be calculated as follows:

Molar mass of benzene (C6H6) = (6 × atomic mass of carbon) + (6 × atomic mass of hydrogen)= (6 × 12.01) + (6 × 1.01)= 72.06 + 6.06= 78.12 g/mol.

Now, we can calculate the number of moles of benzene present in 390 g of benzene as follows:

moles of benzene = mass of benzene / molar mass of benzene= 390 / 78.12= 4.998 mol.

We can round off the answer to one decimal place, and we get 5 mol. Hence,option (a) 5 mol.

The number of moles of benzene present in 390 g of benzene is 5 mol.

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