Difference between revisions of "Yield (Chemistry)"
Line 130: | Line 130: | ||
:[https://www.amazon.co.uk/gp/product/1782948147/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948147&linkCode=as2&tag=nrjc-21&linkId=f63dcd8345f4e49c717b39a228a36c7c ''Yields, pages 172-174, 189-191, 201-203, GCSE Chemistry, CGP, Edexcel ''] | :[https://www.amazon.co.uk/gp/product/1782948147/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948147&linkCode=as2&tag=nrjc-21&linkId=f63dcd8345f4e49c717b39a228a36c7c ''Yields, pages 172-174, 189-191, 201-203, GCSE Chemistry, CGP, Edexcel ''] | ||
:[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Yields, pages 66, 68, GCSE Chemistry; The Revision Guide, CGP, Edexcel ''] | :[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Yields, pages 66, 68, GCSE Chemistry; The Revision Guide, CGP, Edexcel ''] | ||
+ | |||
+ | ====OCR==== | ||
+ | :[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Yield, pages 158-161, 190, 200-203, 205, Gateway GCSE Chemistry, Oxford, OCR ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1782945679/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945679&linkCode=as2&tag=nrjc-21&linkId=a2db42f7b4bdf10cafaafa3bb9120940 ''Yield, pages 66, 74, 80, 82, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1782945660/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945660&linkCode=as2&tag=nrjc-21&linkId=83aa4500ad7759e7f401a1c5ba5df758 ''Yields (in agriculture), pages 86, 87, Gateway GCSE Biology; The Revision Guide, CGP, OCR ''] |
Latest revision as of 12:15, 25 December 2019
Contents
Key Stage 4
Meaning
Yield is the mass of product in a chemical reaction.
About Yield
- The theoretical yield of product from a chemical reaction can be calculated using the balanced symbol equation and the relative formula masses of all the molecules involved.
- The experimental yield from a chemical reaction is often not as large as the theoretical yield because not all of the reactants will react. This experimental yield is often expressed as a percentage of the theoretical yield and is known as the Percentage Yield.
Examples
Calculate the yield of Magnesium Oxide given 48g of Magnesium and excess Oxygen. |
Find the yield of Water when 320g of Methane reacts with excess Oxygen. |
Find the yield of Sodium Chloride when 7.3 of Hydrochloric Acid reacts with excess Sodium Hydroxide. |
Write the Balanced Symbol Equation 2Mg + O2 → 2MgO |
Write the Balanced Symbol Equation CH4 + 2O2 → 2H2O + CO2 |
Write the Balanced Symbol Equation NaOH + HCl → NaCl + H2O |
Find the Relative Formula Mass of the relevant reactants and product. Mr of Mg = 24g Mr of MgO = 40g |
Find the Relative Formula Mass of the relevant reactants and product. Mr of CH4 = 16g Mr of H2O = 18g |
Find the Relative Formula Mass of the relevant reactants and product. Mr of NaOH = 40g Mr of HCl = 36.5g Mr of NaCl = 58.5g |
Find the number of moles supplied of the known mass. No. Moles = \(\frac{Mass}{M_r}\) No. Moles = \(\frac{48}{24}\) No. Moles = 2 mol Therefore 2 moles of MgO is produced. 2 moles of MgO = 40x2 Yield = 80g |
Find the number of moles supplied of the known mass. No. Moles = \(\frac{Mass}{M_r}\) No. Moles = \(\frac{320}{16}\) No. Moles = 20 mol Therefore 40 moles of H2O are produced. 40 moles of CO2 = 18x40 Yield = 720g |
Find the number of moles supplied of the known mass. No. Moles = \(\frac{Mass}{M_r}\) No. Moles = \(\frac{7.3}{36.5}\) No. Moles = 0.2 mol Therefore 0.2 mole of Sodium Chloride is produced. 0.2 mole of NaCl = 11.7g Yield = 11.7g |
References
AQA
- Yield, page 66-7, GCSE Biology; Student Book, Collins, AQA
- Yield, page 78, GCSE Chemistry, Hodder, AQA
- Yield, pages 184-186, GCSE Combined Science Trilogy; Chemistry, CGP, AQA
- Yield, pages 68-71, GCSE Chemistry; Third Edition, Oxford University Press, AQA
- Yield, pages 97, 216-219, 317, 323, GCSE Chemistry; Student Book, Collins, AQA
- Yields, pages 141, 144, 216-218, GCSE Chemistry, CGP, AQA
- Yields, pages 45, 49, GCSE Chemistry; The Revision Guide, CGP, AQA
Edexcel
- Yields, pages 172-174, 189-191, 201-203, GCSE Chemistry, CGP, Edexcel
- Yields, pages 66, 68, GCSE Chemistry; The Revision Guide, CGP, Edexcel