Learn how to solve problems like this one with our expert tutor.

Problem: Calculate the maximum numbers of moles and grams of H2S that can form when 158 g of aluminum sulfide reacts with 131 g of water: Al2S3 + H2O ⟶Al(OH)3 + H2S [unbalanced]How many grams of the excess reactant remain?

FREE Expert Solution
  • Using stoichiometry and a balanced equation, we can find the moles and mass of H2S using the molar masses and mass of reactants given

  • The limiting reactant will tell how much moles of H2S will be produced 

  • Balancing the reaction, balance Al first (2 on both sides): 

Al2S+ H2O ⟶ 2Al(OH)3 + H2S

  • Balance S (3 on both sides)

Al2S+ H2O ⟶ 2Al(OH)3 + 3H2S

  • Balance H and O (6 O and 10 H atoms on both sides)

Al2S+ 6H2O ⟶ 2Al(OH)3 + 3H2S (balanced equation)

  • Calculating for the molar masses:

MM of H2S

H - 1.01 (2) = 2.02

S - 32.07 (1) = 32.07

2.02 + 32.07 = 34.09 g/mol

MM of Al2S3:

Al - 26.98 (2) = 53.96

S - 32.07 (3) = 96.21

53.96 + 96.21 = 150.17 g/mol

MM of H2O :

H - 1.01 (2) = 2.02

O - 16 (1) = 16

16 + 2.02 = 18.02 g/mol

  • Calculating for the moles of H2S produced by the reactants:

95% (408 ratings)
View Complete Written Solution
Problem Details

Calculate the maximum numbers of moles and grams of H2S that can form when 158 g of aluminum sulfide reacts with 131 g of water: Al2S3 + H2O ⟶Al(OH)3 + H2S [unbalanced]

How many grams of the excess reactant remain?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Limiting Reagent concept. If you need more Limiting Reagent practice, you can also practice Limiting Reagent practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Kelly's class at UCB.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.