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

Baseline noise HPLC, your HPLC system has efficiency 1500 theor. Plates, bu...

your HPLC system has efficiency 1500 theor. Plates, but baseline is very noisy. You have a choice either increase response time or decrease attenuation. what will you choose and wh

Dienes - hydrocarbon, Dienes - Hydrocarbon These are hydrocarbon along ...

Dienes - Hydrocarbon These are hydrocarbon along with two carbon-carbon double bonds. Dienes are of three forms (a) Conjugated dienes: Double bonds are seperated through one

Ether formation - hydrocarbon, Ether formation - Hydrocarbon Phenol rea...

Ether formation - Hydrocarbon Phenol reacts along with alkyl halides in alkali solution to make phenyl ethers (Williamson's synthesis). The phenoxide atom is a nucleophile and

Hell volhard-zelinsky reaction - carboxylic acids, Hell Volhard-zelinsky re...

Hell Volhard-zelinsky reaction In presence of Red P and diffused light or Hell Volhard-zelinsky reaction Carboxylic acid comprising an α-hydrogen react with Cl 2 or Br 2 i

Find series of hydrogen atom spectrum electronic transition, In Balmer seri...

In Balmer series of hydrogen atom spectrum which electronic transition causes third line: (1) Fifth Bohr orbit to second one (2) Fifth Bohr orbit to first one (3) Fourth

Phase rule, what is degree of freedom?

what is degree of freedom?

How to find which compound is acid or basic?, We can find a compound  is  a...

We can find a compound  is  acid or base by using litmus test. Acides turnes red litmus to blue colour, in case of base it turnes blue  litmus to red.(or) According to arrhenius

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