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QLDChemistryQuick questions

Unit 2: Molecular interactions and reactions

Quick questions on Stoichiometry of reactions involving gases (QCE Chemistry Unit 2)

5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What are limiting reactant problems with gases?
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When two reactants are given (one or both gases), determine the limiting reactant first.
What are percent yield with gases?
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Percent yield = (actual yield / theoretical yield) x 100 percent. Express both yields in the same units (both as volume, both as mass, or both as moles).
What is q1?
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State the molar volume of an ideal gas at SLC and at STP. [2 marks]
What is q2?
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Calculate the volume of H2\text{H}_2 produced at SLC when 0.486 g0.486 \, \text{g} Mg reacts with excess HCl. [4 marks]
What is q3?
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Ammonia is synthesised by N2+3H2β†’2NH3\text{N}_2 + 3 \text{H}_2 \rightarrow 2 \text{NH}_3. Starting with 50.0 L50.0 \, \text{L} N2\text{N}_2 and 120.0 L120.0 \, \text{L} H2\text{H}_2 at SLC: (a) Identify limiting reagent. (b) Calculate V(NH3)V(\text{NH}_3).

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