Question

Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas are produced when 27.5g of sodium are added to water?

Answer 1

The reaction given by

• 2Na+2H_2O—»2NaOH+H_2

Moles of sodium:-

• Given mass/Molar mass
• 27.5/23
• 1.196mol

So

• 2mol Na Produces 1 mol H_2
• 1 mol Na Produces 0.5mol H_2
• 1.196 mol Na Produces=0.5(1.196)=0.598mol H_2

Answer 2

.598 moles of H2

Step-by-step explanation:

Find the balanced equation of the reaction

2Na + 2 H2 0 ====> 2 Na OH + H2

27.5 gm of Na is 27.5/ 22.989 =1.196 moles

from the equation, each mole of Na produces 1/2 mole of H2

1.196 moles * 1/2 = .598 moles of H2