Reactants in excess, Chemistry

Assignment Help:

Q. Use of Reactants in Excess?

Ans.

Consider a recipe for pancakes that calls for 2 cups of pancake batter mix and 1 cup of water. The result of this recipe is 14 pancakes.

Let's say you have only one cup of pancake mix. Can you still make the recipe? Of course! just make half the recipe. In this case the pancake mix is the limiting reagent.

What if you have 4 cups of water but only 2 cups of pancake mix? The two reactants aren't present in the correct ratio, so one of these is the limiting reagent. It seems that the limiting reagent is the pancake mix and that there are 2 cups of water in excess. A reactant in excess will always have an amount left over after the other reactant is used up.

Now in chemical terms, let's examine the idea of limiting reagent and excess.

2 Mg + O2 -> 2 MgO

Let's say in our case 1 mole of oxygen reacts with 3 moles of magnesium. You still obtain 2 moles of magnesium oxide. There is 1 mole of magnesium in excess, which tells you oxygen is the limiting reagent.


Related Discussions:- Reactants in excess

Pauli exclusion principle, Electron configurations are governed by a limita...

Electron configurations are governed by a limitation called as the Pauli Exclusion Principle: No two electrons can have the same value for all four quantum numbers n, l, m a

Eectrochemistry, Difference between activity coefficient and mean activity...

Difference between activity coefficient and mean activity coefficiet

S block element ., discuss the structure of beryllium chloride Becl2.

discuss the structure of beryllium chloride Becl2.

Which quantum number will determine the shape the subshell, Which quantum n...

Which quantum number will determine the shape of the subshell: (1) Principal quantum number (2) Azimuthal quantum number (3) Magnetic quantum number (4)Spin quantum nu

Name the three ways in which consumer testing can be done, Q. Name the thre...

Q. Name the three ways in which consumer testing can be done? The three ways by which consumer testing can be done are: inhouse laboratory testing, home testing and institution

Univercity student, whats is surfactant and its applications in cloud point...

whats is surfactant and its applications in cloud point extraction ?

Define first law of faraday, The quantity of substance liberated, dissolved...

The quantity of substance liberated, dissolved, or deposited at an electrode is directly proportional to the quantity of electricity passed by the electrolyte.

All the bonds pcl5 are not equivalent, Give chemical reaction in support of...

Give chemical reaction in support of each of the following statements: (i) The +1 oxidation state gets stabilised progressively from Ga to TI in Group (ii) All the bonds PCl5

Rutherford''s scattering experiment is related to the size, Rutherford's sc...

Rutherford's scattering experiment is related to the size of the: (1) Nucleus          (2) Atom      (3) Electron   (4) Neutron Ans: Nucleus

Explain salt bridge with its functions., Salt bridge is a U-shaped tube con...

Salt bridge is a U-shaped tube containing a semi-solid paste of some inert electrolyte like  KCl, KNO 3 , NH 4 Cl,  etc. in agar-agar and gelatin. An inert electrolyte is one which

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd