Question

If a 210.5g sample of phenol (C6H5OH) is isolated in a laboratory how many
moles of hydrogen are within phenol. (C6H5OH=94.11g/mol]
0.372 mol H
13.4 mol H.
11.2 mol H
2.23 mol H

Answer 1

Answer:

13.4mol of H

Explanation:

Given parameters:

Mass of phenol  = 210.5g

Molar mass of phenol  = 94.11g/mol

Unknown:

Number of moles of phenol  = ?

Solution:

To solve this problem, we have to find the number of moles of phenol first.

  Number of moles  = $\frac{mass}{molar mass}$

   Number of moles = $\frac{210.5}{94.11}$   = 2.24mol

   1 mole of C₆H₅OH contains 6 moles of H atoms

  2.24 moles of  C₆H₅OH will contain 6 x 2.24 mole of H =

                        13.4mol of H atoms