Question

Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas are formed when 48.7 g of sodium are added to water? The euation is as follows :- 2Na + 2H2O --> 2NaOH + H2

Answer 1

2Na + 2H2O ----> H2 + 2Na(OH)

48.7/23 = 2.12 moles sodium
2.12/2 x 24 = 25.44dm^3 hydrogen = 1.06 moles

1.06 X 6.02x10^23 = 1.204x10^24 molecules of hydrogen