How many molecules of NH3 will be produced if I use 10g of H2?

20.05  ×10²³ molecules

Explanation:

Given data:

Mass of hydrogen = 10 g

Number of molecules of ammonia = ?

Solution:

Chemical equation:

3H₂ + N₂       →      2NH₃

Number of moles of hydrogen:

Number of moles = mass / molar mass

Number of moles =  10 g /  2 g/mol

Number of moles =  5 mol

now we will compare the moles of hydrogen and ammonia.

                 H₂            :           NH₃

                  3             :            2

                   5            :           2/3×5 = 3.33 mol

Number of molecules of ammonia:

1 mole contain 6.022 ×10²³ molecules

3.33 mol × 6.022 ×10²³ molecules / 1 mol

20.05  ×10²³ molecules

pure substance: iron,copper

impure substance: water,charcoal

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: