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Physical Chemistry

Quick questions on The mole concept and stoichiometry: Singapore A-Level H2 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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Calculate the number of molecules in 0.250.25 mol of carbon dioxide. [1 mark]
What is q2?
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4.04.0 g of hydrogen reacts with 32.032.0 g of oxygen to form water (2H2+O2→2H2O2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}). Identify the limiting reagent. [3 marks]
What is q3?
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20.020.0 cm cubed of 0.1500.150 mol per dm cubed NaOH is exactly neutralised by 18.018.0 cm cubed of sulfuric acid. Calculate the acid concentration. (2NaOH+H2SO4→Na2SO4+2H2O2\text{NaOH} + \text{H}_2\text{SO}_4 \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O}.)

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