Question detail
In the reaction 2H2 + O2 → 2H2O, calculate the mass of water produced when 4 g of hydrogen is reacted. (Relative atomic masses: H = 1, O = 16)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
In the reaction 2H2 + O2 → 2H2O, calculate the mass of water produced when 4 g of hydrogen is reacted. (Relative atomic masses: H = 1, O = 16)
Answer
36 g
Explanation
This question tests the ability to apply the concept of moles and mass calculations using a balanced equation. The student must first convert the mass of hydrogen to moles, use the mole ratio from the balanced equation to find moles of water produced, and then convert back to mass.
Common mistake
Confusing Reactants and Products
Students often confuse the masses of reactants with the masses of products when calculating from a balanced equation.
Carefully identify which substances are reactants and which are products in the balanced equation before performing calculations.
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