How Many Moles Of Phosphoric Acid Are There In 658 Grams Of Phosphoric Acid?

How many moles of phosphoric acid are there in 658 grams of phosphoric acid?

Good Day...

Problem:

How many moles of phosphoric acid are there in 658 grams of phosphoric acid?

Note: the molar mas of phosphoric acid (H3PO4) is 97.994 g/mol

but some teachers tries to round off the atomic weight of elements to whole number.

H (hydrogen) =  1 amu × 3 = 3 amu

P(phosphorus) = 31 amu × 1 = 31 amu

O (oxygen) = 16 amu × 4 = 64 amu

                                          98 amu

 Molar mass is = = 98 g / mol   in whole number

I will solved the problem using molar mass of 98 g/mol and 97.994 g/mol

Given Data:

658 grams phosphoric acid  = ________moles of phosphoric acid

Solution:

To convert mass in grams to moles of a compound,  we have to divide the given mass in grams of the substance to its molar  mass.

moles of phosphoric acid using molar mass 98 g/mol  :

moles of phosphoric acid  = 658 grams ÷ 98 g/mol (cancel the unit gram)

                                             = 6.714 moles

moles of phosphoric acid using molar mass 97.994 g/mol  :

moles of phosphoric acid = 658 grams ÷ 97.994 g/mol  (cancel unit  g )

                                             = 6.715 moles

Hope it helps...=)

                 

             


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