Class 11 Exam > Class 11 Notes > Chemical Reaction & Equation, Class 11, Science
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For the reaction 2x + 3y + 4z → 5wInitially if 1 mole of x, 3 mole of y and 4 mole of z is taken. If 1.25 mole of w is obtained then % yield of this reaction isa)50%b)60%c)70%d)40%Correct answer is option 'A'. Can you explain this answer?
Ref: https://edurev.in/question/474916/For-the-reaction-2x-3y-4z-rarr-5wInitially-if-1-mole-of-x-3-mole-of-y-and-4-mole-of-z-is-taken-If-
The percent yield is 50 %.
This is a limiting reactant problem.
We know that we will need a balanced equation and moles of each reactant.
1. Gather all the information in one place with the experimental number of moles below the formulas.
2x + 3y+4z=5w
Amt/mol: 1 3 4
Divide by: 2 3 4
Moles rxn: 0.5 1 1
2. Identify the limiting reactant
An easy way to identify the limiting reactant is to calculate the "moles of reaction" each will give:
You divide the moles of each reactant by its corresponding coefficient in the balanced equation.
I did that for you in the table above.
x is the limiting reactant because it gives the fewest moles of reaction.
3. Calculate the theoretical yield of w
Theoretical yield= 1mollx × 5 mol w/2mol x=2.5 mollw
4. Calculate the percent yield
Percent yield=Actual yield/Theoretical yield × 100% = 1.25mol/2.5mol × 100% = 50%
FAQs on Chemical Reaction & Equation, Class 11, Science
| 1. What is a chemical reaction? |  |
Ans. A chemical reaction is a process in which one or more substances, known as reactants, undergo a transformation to form different substances, known as products. This transformation occurs due to the breaking and forming of chemical bonds between atoms.
| 2. What is a chemical equation? | |
Ans. A chemical equation is a symbolic representation of a chemical reaction. It uses chemical formulas and symbols to depict the reactants and products involved in the reaction. The reactants are written on the left side of the equation, while the products are written on the right side, separated by an arrow.
| 3. How can chemical reactions be classified? | |
Ans. Chemical reactions can be classified into different categories based on various factors. Some common classifications include:
- Combination or synthesis reactions: These reactions involve the combination of two or more substances to form a single product.
- Decomposition reactions: These reactions involve the breakdown of a compound into simpler substances.
- Displacement reactions: These reactions involve the displacement of one element by another in a compound.
- Redox reactions: These reactions involve the transfer of electrons between reactants, resulting in a change in oxidation states.
- Acid-base reactions: These reactions involve the transfer of protons (H+) between acids and bases.
| 4. What are the importance and applications of chemical reactions? | |
Ans. Chemical reactions are of great importance in various fields and have numerous applications. Some of them include:
- Industrial processes: Chemical reactions are essential in industries for the production of various substances, such as fertilizers, plastics, pharmaceuticals, and fuels.
- Environmental processes: Chemical reactions play a crucial role in natural processes like photosynthesis, respiration, and the nitrogen cycle.
- Biological processes: Chemical reactions are involved in biological processes such as digestion, metabolism, and cellular respiration.
- Medicinal applications: Chemical reactions are utilized in the development and synthesis of drugs and medicines to treat various diseases.
- Energy production: Chemical reactions, such as combustion reactions, are used to generate energy in the form of heat and electricity.
| 5. How can chemical reactions be represented and balanced? | |
Ans. Chemical reactions can be represented using chemical equations, where the reactants and products are written using chemical formulas and symbols. To balance a chemical equation, the number of atoms of each element on both sides of the equation should be equal. This is achieved by adjusting the coefficients placed in front of the formulas of reactants and products. The Law of Conservation of Mass states that matter cannot be created or destroyed in a chemical reaction, so the total mass of the reactants must be equal to the total mass of the products.
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Nov 24, 2024 Last updated |
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