Chemistry, 06.09.2019 17:10 yannie16

Magnesium oxide can be made by heating magnesium metal in the presence of the oxygen. the balanced equation for the reaction is 2 mg(s) + o2(g) → 2 mgo(s) now consider that you react 10.0 g mg with 6.00 g o2 gas. if you were able to collect 9.62 g of mgo, what would be your percent yield for the reaction?

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Answer from: Edith21

Answer : The percent yield of MgO is, 64.13 %

Solution : Given,

Mass of Mg = 10 g

Mass of O_2 = 6 g

Molar mass of Mg = 24 g/mole

Molar mass of O_2 = 32 g/mole

Molar mass of MgO = 40 g/mole

First we have to calculate the moles of Mg and O_2 .

$\text{ Moles of }Mg=\frac{\text{ Mass of }Mg}{\text{ Molar mass of }Mg}=\frac{10g}{24g/mole}=0.4167moles$

$\text{ Moles of }O_2=\frac{\text{ Mass of }O_2}{\text{ Molar mass of }O_2}=\frac{6g}{32g/mole}=0.1875moles$

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$2Mg(s)+O_2(g)\rightarrow 2MgO(s)$

From the balanced reaction we conclude that

As, 1 mole of O_2 react with 2 mole of

So, 0.1875 moles of O_2 react with $0.1875\times 2=0.375$ moles of

From this we conclude that, is an excess reagent because the given moles are greater than the required moles and O_2 is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of MgO

From the reaction, we conclude that

As, 1 mole of O_2 react to give 2 mole of MgO

So, 0.1875 moles of O_2 react to give $0.1875\times 2=0.375$ moles of MgO

Now we have to calculate the mass of MgO

$\text{ Mass of }MgO=\text{ Moles of }MgO\times \text{ Molar mass of }MgO$

$\text{ Mass of }MgO=(0.375moles)\times (40g/mole)=15g$

Theoretical yield of MgO = 15 g

Experimental yield of MgO = 9.62 g

Now we have to calculate the percent yield of MgO

$\% \text{ yield of }MgO=\frac{\text{ Experimental yield of }MgO}{\text{ Theretical yield of }MgO}\times 100$

$\% \text{ yield of }MgO=\frac{9.62g}{15g}\times 100=64.13\%$

Therefore, the percent yield of MgO is, 64.13 %

Answer from: Quest

the solar system used to have much dust particles option no d

Which of the following best illustrates the role that gravity played in the formation of the solar s

Answer from: Quest

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.

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