Asolid sample (sample 1) is analyzed and found to contain 1.47 g carbon and 0.123 g hydrogen. a second sample (sample 2) is expected to be composed of the same pure compound. if sample 2 is found to contain 2.17 g hydrogen, how much carbon is expected in the sample ?

Explanation:

Here it is given that carbon is sample 2 = 25.9 g

No. of moles of carbon will be calculated as follows.

         No. of moles of carbon =

                                                 =

                                                 = 0.1224 mol

It is also given that mass of hydrogen = 0.123 g

Hence, calculate number of moles of hydrogen as follows.

           No. of moles of hydrogen =

                                                      =

                                                      = 0.122 mol

Therefore,

                              =

                                = 1.003

Therefore, calculate the number of moles of hydrogen as follows.

       No. of moles of hydrogen =

                                          =

                                          = 2.1528 mol

Hence, calculate the moles of carbon as follows.

      Moles of carbon =

                                   =

                                  = 2.16 mol

Mass of carbon = moles carbon × molar mass carbon

                           = (2.16 mol) × (12.01 g/mol)

                           = 25.9 g

Thus, we can conclude that 25.9 g of carbon is expected in the sample.

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