Here's how to calculate the number of moles of C6H6 (benzene) in 195g:

1. Find the molar mass of C6H6:

* Carbon (C) has a molar mass of 12.01 g/mol.

* Hydrogen (H) has a molar mass of 1.01 g/mol.

* Molar mass of C6H6 = (6 * 12.01 g/mol) + (6 * 1.01 g/mol) = 78.11 g/mol

2. Use the formula:

* Moles = Mass / Molar Mass

3. Plug in the values:

* Moles = 195 g / 78.11 g/mol

* Moles ≈ 2.49 mol

Therefore, there are approximately 2.49 moles of C6H6 in 195g.