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

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  =

   Number of moles =   = 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

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml