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VICChemistryQuick questions

Unit 2: How do chemical reactions shape the natural world?

Quick questions on Stoichiometry of aqueous reactions: VCE 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 is percentage yield?
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The theoretical yield is the mass (or amount) of product predicted by stoichiometry from the limiting reagent, assuming the reaction goes to completion and nothing is lost.
What is concentration of a product in solution?
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When the product stays in solution, the answer is usually a molar concentration:
What is q1?
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20.0 mL20.0 \, \text{mL} of 0.150 mol/L0.150 \, \text{mol/L} HCl\text{HCl} is added to 30.0 mL30.0 \, \text{mL} of 0.100 mol/L0.100 \, \text{mol/L} NaOH\text{NaOH}. Calculate the resulting [H+][\text{H}^+] in the mixture. [3 marks]
What is q2?
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A 50.0 mL50.0 \, \text{mL} sample of 0.200 mol/L0.200 \, \text{mol/L} BaCl2\text{BaCl}_2 is mixed with 50.0 mL50.0 \, \text{mL} of 0.300 mol/L0.300 \, \text{mol/L} Na2SO4\text{Na}_2 \text{SO}_4. (a) Write the net ionic equation. (b) Identify the limiting reagent.
What is q3?
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A laboratory prepares CuSO4⋅5H2O\text{CuSO}_4 \cdot 5 \text{H}_2 \text{O} from 5.00 g5.00 \, \text{g} of CuO\text{CuO} and excess sulfuric acid. (a) Write the equation. (b) Calculate the theoretical mass of hydrated product.

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