Stoichiometry and the Gas Laws — Test

Question 21 • Chemistry

Consider the balanced equation. 2 cap h sub 2 cap s plus 3 cap o sub 2 rightarrow 2 SO sub 2 plus 2 cap h sub 2 cap o Which option gives the correct mole ratios?

Answer

cap h sub 2 ratio of cap s to SO sub 2 is equal to ratio of 2 to 2 and ratio of cap o sub 2 to cap h sub 2 cap o is equal to ratio of 3 to 2

cap h sub 2 ratio of cap s to SO sub 2 is equal to ratio of 2 to 3 and ratio of cap o sub 2 to cap h sub 2 cap o is equal to ratio of 3 to 2

cap h sub 2 ratio of cap s to SO sub 2 is equal to ratio of 4 to 4 and ratio of cap o sub 2 to cap h sub 2 cap o is equal to ratio of 5 to 4

cap h sub 2 ratio of cap s to SO sub 2 is equal to ratio of 4 to 6 and ratio of cap o sub 2 to cap h sub 2 cap o is equal to ratio of 4 to 4

Explanation

In a balanced chemical equation, the coefficients give the mole ratios between substances. Here, 2 H₂S produces 2 SO₂, so the H₂S-to-SO₂ ratio is 2:2. The equation also uses 3 O₂ for every 2 H₂O, giving a ratio of 3:2. Both ratios match choice A.

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