How many molecules (not moles) of nh3 are produced from 5.01×10−4 g of h2?

Answer : The number of molecules of produced are

Explanation :

The given balanced chemical reaction will be,

First we have to calculate the moles of .

Now we have to calculate the moles of .

From the balanced chemical reaction we conclude that,

As, 3 moles of react to produce 2 moles of

So, of react to produce moles of

Now we have to calculate the number of molecules of .

As, 1 mole of produces molecule of

So, of produces molecule of

Therefore, the number of molecules of produced are

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

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