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

Explain the term forging with diagram, Explain the term Forging with diagra...

Explain the term Forging with diagram Forging is shaping of metal either by steady compression or impact between a hammer or ram and anvil. Related to pressing of metal or

Lyman series, For a hydrogen atom, calculate the wavelength (in nm) of an e...

For a hydrogen atom, calculate the wavelength (in nm) of an emitted photon in the Lyman series that results from the transition n = 3 to n = 1

Solubility of one liquid in other -liquid liquid equilibria, Explain Solubi...

Explain Solubility of one liquid in another -Liquid–Liquid Equilibria   Suppose substances A and B are both liquids when pure. In discussing the solubility of liquid B in li

Aromatic nitro compounds - nitrogen containing compounds, Aromatic Nitro Co...

Aromatic Nitro Compounds Aromatic nitro compounds are the derivatives of aromatic hydrocarbons where one or more hydrogen atom (s) of the benzene nucleus has been changed by ni

Distillation under reduced pressure, Distillation under reduced pressure - ...

Distillation under reduced pressure - Purification of organic compounds This process is employed for the purification of high boiling liquids and liquids that decompose at o

Define geometrical isomerism, Isomers, which vary in the orientation of gro...

Isomers, which vary in the orientation of groups around the double bounded carbon atoms, are known as geometrical Isomers. It is also known as Cis-Trans Isomerism.

The fermi level is, The Fermi level is The highest occupied energy lev...

The Fermi level is The highest occupied energy level at 0 0 K.

Pick out the isoelectronic structures from the following, Pick out the isoe...

Pick out the isoelectronic structures from the following :                               CH + 3 ,    H 3 O +       NH 3        CH - 3                                 I

Determine about the line and surface imperfection, Determine about the Line...

Determine about the Line and Surface Imperfection Line imperfection:   Displacement with a curved boundary produces a mixed dislocation line at the boundary. Surface Imp

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