Respuesta :

Answer:

0.27 mole

Explanation:

Data given:

mass of hydrochloric acid (HCl) = 20 g

moles of hydrogen (H₂O) = ?

Solution:

First we look to the reaction in which hydrogen react with Chlorine and make hydrochloric acid (HCl)

Reaction:

              H₂ + Cl₂ -----------> 2HCl

Now look at the reaction for mole ratio

              H₂ + Cl₂ -----------> 2HCl

              1 mole                    2 mole

So it is 1:2 mole ratio of hydrogen to hydrochloric acid (HCl)

As we Know

molar mass of H₂ = 2(1) = 2 g/mol

molar mass of HCl = 1 + 35.5 = 36.5 g/mol

Now convert moles to gram

                     H₂         +       Cl₂    ----------->     2HCl

            1 mole (2 g/mol)                             2 mole (36.5 g/mol)

                     2 g                                                 73 g

So,

we come to know that 2 g of hydrogen gives 73 g of hydrochloric acid (HCl) then how many grams of hydrogen will be required to produce 20 grams of hydrochloric acid (HCl).

Apply unity formula

                            2 g of H₂ ≅ 73 g of HCl

                            X g of H₂ ≅ 20 g of HCl

Do cross multiplication

                            X of H₂ = 2 g x 20 g / 73 g

                            X of H₂ = 0.55 g

Now convert grams of H₂ into moles

                    No. of moles = mass in grams/molar mass

Put values in above formula

                   No. of moles = 0.55 g / 2 (g/mol)

                   No. of moles = 0.27 mol

0.27 mole of hydrogen needed to produce 20 gram of hydrochloric acid (HCl).

The Answer will be: 0.27 mole

                    Data are given now:

  • When the mass of hydrochloric acid is (HCl) = 20 g
  • After that, the moles of hydrogen  is (H₂O) =?
  • Now the Solution is:
  • When First we look to the reaction in which hydrogen reacts with Chlorine and also make hydrochloric acid (HCl)

                  The Reaction is:

Then:             H₂ + Cl₂ -----------> 2HCl

  • Now we look at the reaction for mole ratio is:

After that the reaction is             H₂ + Cl₂ -----------> 2HCl

                                                      1 mole                    2 mole

  • Then So it is 1:2 mole ratio of hydrogen to hydrochloric acid (HCl) is
  • When the molar mass of H₂ = 2(1) = 2 g/mol
  • Then molar mass of HCl = 1 + 35.5 = 36.5 g/mol
  • Now  we are converted moles to gram

                    H₂         +       Cl₂    ----------->     2HCl

                  1 mole (2 g/mol)                      2 mole (36.5 g/mol)

                    2 g                                                 73 g

  • Now 2 g of hydrogen gives 73 g of hydrochloric acid (HCl) then now after that how many grams of hydrogen will be required to produce 20 grams of hydrochloric acid (HCl).

          After that Apply the unity formula is:

 Then:                          2 g of H₂ ≅ 73 g of HCl

 Now:                            X g of H₂ ≅ 20 g of HCl

              Now Do cross multiplication

  • Then  -                         X of H₂ = 2 g x 20 g / 73 g
  • Now    -                       X of H₂ = 0.55 g
  • After that Now convert grams of H₂ into moles

        No. of moles = mass in grams/molar mass

  • Then Put values in the above formula are:
  •     That is            No. of moles = 0.55 g / 2 (g/mol)
  •     After that              No. of moles = 0.27 mol
  • After that, 0.27 mole of hydrogen is needed to produce 20 grams of hydrochloric acid (HCl).

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