What is the theoretical yield (in mL) at STP of hydrogen gas produced when the 0.040 g of Mg reacted completely?
Correct answer: C. 37 mL
- A. 10 mL
- B. 25 mL
- C. 37 mL
- D. 46 mL
- E. 51 mL
Explanation
The theoretical yield at STP can be found from the chemical equation of the reaction: 0.040 g Mg = x L Mg + 2HCL → MgCl2 + H2 (g) 24.0 g/mol = 22.4 L Solving for x L = 0.037 L or 37 ml
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Separation methods are selected according to differences in solubility, particle size, volatility and sublimation behaviour. Filtration and crystallisation separate insoluble or dissolved solids, sublimation isolates suitable volatile solids, distillation separates liquids by boiling point, and solvent extraction transfers a substance between immiscible solvents.
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