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Q91 (NDA-I/2009) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic chemical principles Answer Verified

Consider the following equation for the formation of ammonia from nitrogen and hydrogen: ; N2 + 3H2 = 2NH3, How many hydrogen molecules are required to react with 100 molecules of nitrogen?

Result
Your answer: —  Â·  Correct: C
Explanation

The formation of ammonia (NH3) from nitrogen (N2) and hydrogen (H2) is governed by the balanced chemical equation: N2 + 3H2 → 2NH3 [t1, t3]. According to the principles of stoichiometry, the coefficients in a balanced equation represent the molar or molecular ratio of the reactants and products [t4, t5]. In this specific reaction, one molecule of nitrogen reacts with exactly three molecules of hydrogen to produce two molecules of ammonia [t1]. Therefore, the stoichiometric ratio of N2 to H2 is 1:3. To find the amount of hydrogen required for 100 molecules of nitrogen, we multiply the number of nitrogen molecules by the ratio (100 × 3). This calculation results in 300 molecules of hydrogen being necessary for a complete reaction with 100 molecules of nitrogen [t1].

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