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ScotlandChemistryQuick questions

Area 3: Chemistry in Society

Quick questions on Getting the most from reactants: percentage yield and atom economy - SQA Higher Chemistry

3short 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 q1?
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A reaction has a theoretical yield of 40 g40 \text{ g} but only 32 g32 \text{ g} is obtained. Calculate the percentage yield. [1 mark]
What is q2?
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State one reason a reactant might be added in excess in an industrial process. [1 mark]
What is q3?
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For CH4+Cl2→CH3Cl+HClCH_4 + Cl_2 \rightarrow CH_3Cl + HCl, calculate the atom economy for CH3ClCH_3Cl. (GFMGFM: CH4=16.0CH_4 = 16.0, Cl2=71.0Cl_2 = 71.0, CH3Cl=50.5CH_3Cl = 50.5.) [2 marks]

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