102k views
5 votes
13. Solid sodium reacts violently with water producing heat, hydrogen gas and sodium hydroxide. How many molecules of hydrogen gas are produced when 65.4 g of sodium are added to water? 2Na(s) + 2H2O(l) → 2NaOH (aq) + H2(g)(1 point for molar mass of sodium, 1 point for correct mole ratio, 1 point for work, 1 point for correct answer with correct units) (4 points total) *

Your answer

1 Answer

3 votes
To make the first step we should remember that the molar mass of sodium is about 23.0 g/mol.
As you know, two moles of sodium produce one mole of hydrogen which means we can already get maximum yield of hydrogen:

2.84 / 2 = 1.42 moles.
Since you have to get number of molecules you need to multiply the number of moles by the Avogadro's constant, and you will get :


1.42 * 6.022 * 10^23 ~ 8.56 * 10^23
Hope it will help you to solve the task.
User PMende
by
8.7k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.