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Ch.3 - Mass Relationships in Chemical Reactions
McMurry - Chemistry 8th Edition
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Tutti i libri di testoMcMurry 8th EditionCh.3 - Mass Relationships in Chemical ReactionsProblema 73b
Capitolo 3, Problema 73b

Hydrazine, N2H4, once used as a rocket propellant, reacts with oxygen: N2H4 + O2 → N2 + 2 H2O (b) How many grams of N2 are obtained if the yield is 85.5%?

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Identify the balanced chemical equation: N_2H_4 + O_2 \(\rightarrow\) N_2 + 2 H_2O.
Determine the molar mass of N_2H_4 and N_2 using the periodic table.
Calculate the theoretical yield of N_2 in moles based on the stoichiometry of the balanced equation.
Convert the theoretical yield of N_2 from moles to grams using its molar mass.
Calculate the actual yield of N_2 by multiplying the theoretical yield in grams by the percentage yield (85.5%).

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Stoichiometry

Stoichiometry is the calculation of reactants and products in chemical reactions based on the balanced chemical equation. It allows us to determine the amount of product formed from a given amount of reactant, using mole ratios derived from the coefficients in the balanced equation. In this case, understanding the stoichiometric relationship between hydrazine and nitrogen is essential to calculate the theoretical yield of N2.
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Stoichiometry Concept

Percent Yield

Percent yield is a measure of the efficiency of a chemical reaction, calculated by comparing the actual yield of a product to the theoretical yield. It is expressed as a percentage and is crucial for understanding how much of the expected product is actually produced in practice. In this question, the yield of 85.5% indicates that only a portion of the theoretical amount of N2 is obtained, which must be factored into the final calculation.
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Percent Yield in Reactions

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is essential for converting between moles and grams in stoichiometric calculations. For this question, knowing the molar mass of nitrogen (N2) is necessary to convert the amount of nitrogen produced from moles to grams, allowing for the final answer to be expressed in grams.
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Molar Mass Concept
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