Question

what is the mole fraction of a substance A in solution if 30 gram of substance is dissolved in 3.25 moles of substance B?​

Answer 1

Answer:

1/4.25

Explanation:

MOLAR MASS OF A=30 (GIVEN)

MOLES OF A = GIVEN MASS/MOLAR MASS

                      =30/30

                      =1 MOLE

MOLES OF B = 3.25 (GIVEN)

MOLE FRACTION IS REPRESENTED BY X

FORMULA FOR MOLE FRACTION = NUMBER OF MOLES OF A  

                                                          -------------------------------------------

                              NUMBER OF MOLES OF A+NUMBER OF MOLES OF B

THEREFORE,

         X FOR SUBSTANCE A=    1/1+3.25

                                                   =1/4.25

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Answer 2

what is the mole fraction of a substance A in solution if 30 gram of substance is dissolved in 3.25 moles of substance B?

MOLAR MASS OF A=30 (GIVEN)

MOLES OF A = GIVEN MASS/MOLAR MASS

                     =30/30

                     =1 MOLE

MOLES OF B = 3.25 (GIVEN)

MOLE FRACTION IS REPRESENTED BY X

FORMULA FOR MOLE FRACTION = NUMBER OF MOLES OF A  

NUMBER OF MOLES OF A+NUMBER OF MOLES OF B

THEREFORE,

        X FOR SUBSTANCE A=    1/1+3.25

                                                  =1/4.25