Question

Aluminum carbide powder decomposes in water:

Al4C3 (s) + 12 H2O (l) → 4 Al(OH)3 (aq) + 3 CH4 (g)

Which of the following pairs of quantities represent the correct stoichiometric amounts for this reaction?
a.
1 mol Al4C3 and 1 mol H2O

b.
4 mol Al4C3 and 24 mol H2O

c.
7.2 g Al4C3 and 1.8 g H2O

d.
1 moles Al4C3 and 12 moles H2O

Answer 1

Answer:

d. 1 mole Al₄C₃ and 12 moles H₂O

Explanation:

The coefficients in a balanced chemical equation indicate the number of moles of reactants and products. If a substance does not have a coefficient written in front of it, it is assumed to be 1.