1 When a piece of sodium metal is dropped into water, hydrogen gas is released leaving a
solution of sodium hydroxide.
(a) Write a balanced equation for this reaction.
(b) Calculate the mass of hydrogen gas released when 43.9 g of sodium reacts.
When sodium metal is dropped in water, hydrogen gas is evolved. Thus, the reaction is, 2Na+2H2O→H2+2NaOH. In the reaction, sodium hydroxide is formed and hydrogen gas is evolved.
