CAST High School Practice Questions - California Science Test (CAST) - High School Exam

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In the balanced equation 2 H₂ + O₂ → 2 H₂O, how many moles of water form when 3.0 mol of H₂ react completely with excess oxygen?

1.5 mol H₂O 2.0 mol H₂O 3.0 mol H₂O 6.0 mol H₂O

Correct Answer:

3.0 mol H₂O

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