Question

calculate the number of moles present in 46 gram of ethanol C2 h5 0h
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Answer 1

Answer:

there are 1 moles

Explanation:

no. of moles = total mass of the compound / the given mass

Answer 2

Answer:

1 mole

Explanation:

Formula: C2H5OH

GMW of Ethanol: (2 x 12) + (5(1)) + 16+ 1

       [took 2 x 12 because there are 2 atoms of carbon] [took 5 x 1 because there are 5 atoms of hydrogen]

                             = 24 + 5+ 17

                              = 46 grams (molecular weight of Ethanol)

So, now you have to find moles:  

See,

Molecular weight of an element or compound =     1 mole (everytime)

 

So, similarly, Let 'x' be the number of moles in 46 g of ethanol

            Molecular weight of ethanol(46 g)      =       1 mole

then for

                      46 gram of ethanol            =         x moles

Her you have to cross multiply......so....

                           x                 =            46/46

                                        which is also equal to 1 mole itself because the weight taken and the molecular weight is same.

Hope it helps:)