Question

A sample of monochloro pentaborane (9), b5h8cl, has a mass of 20.1 g. what amount, in moles, does this mass represent?

Answer 1

The number of moles in monochloro pentaborane (9) $B_5H_8Cl$ is 0.37056.

We know that ,

Number of moles =   Given mass/ Molar mass

Given mass of monochloro pentaborane (9) is 20.1 g

The molar mass of monochloro pentaborane (9) is

                                        =  $5*B + 8*H + Cl$

                                        =  $5* 10.811 + 8 * 1 + 35.453$

                                        = 54.241

Thus number of moles =  20.1/54.241

                                      = 0.37056

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