Chemistry, 30.07.2019 11:00 taylorlawrence8147

Calculate the number of grams of fe2o3 needed to react with 19.0 g c.

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Answer from: 24chrim

The mass of iron (III) oxide needed to react is 67.4 g

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of carbon = 19.0 g

Molar mass of carbon = 12 g/mol

Putting values in equation 1, we get:

$\text{Moles of carbon}=\frac{19.0g}{12g/mol}=1.58mol$

The chemical equation for the reaction of iron (III) oxide and carbon follows:

$2Fe_2O_3+3C\rightarrow 3CO_2+4Fe$

By Stoichiometry of the reaction:

3 moles of carbon reacts with 2 moles of iron (III) oxide

So, 1.58 moles of carbon will react with = $\frac{2}{3}\times 1.58=0.422mol$ of iron (III) oxide

Now, calculating the mass of iron (III) oxide by using equation 1, we get:

Molar mass of iron (III) oxide = 159.70 g/mol

Moles of iron (III) oxide = 0.422 moles

Putting values in equation 1, we get:

$0.422mol=\frac{\text{Mass of iron (III) oxide}}{159.70g/mol}\\\\\text{Mass of iron (III) oxide}=(0.422mol\times 159.70g/mol)=67.4g$

Hence, the mass of iron (III) oxide needed to react is 67.4 g

Answer from: Quest

chemical energy is stored in the chemical bonds of atoms and molecules. it can only be seen when it is released in a chemical reaction. when chemical energy is released, the substance from which the energy came is often changed into an entirely different substance.

this chemical reaction releases energy in the form of light and heat. chemical energy is the potential energy stored in the arrangement of atoms within molecules. breaking chemical bonds requires energy, while forming new chemical bonds releases energy.

the atp molecule can store energy in the form of a high energy phosphate bond joining the terminal phosphate group to the rest of the molecule. in this form,energy can be stored at one location, then moved from one part of the cell to another, where it can be released to drive other biochemical reactions.

Answer from: Quest

1.consider the following balanced equation and answer parts a through. show calculations for each part.

3 ag(s) + 4 hno3(aq) → 3 agno3(aq) + no(g) + 2 h2o(l)

a. calculate the number of moles of agno3 produced by the reaction of 3 moles of ag with excess hno3. if the number to the left of the compound represents the number of moles of the compound which are present, then 3 moles of ag react with 4 moles hno3 to produce 3 moles agno3 (aq).

so the answer to a would be 3 moles.

b. calculate the number of moles of agno3 produced by the reaction of 108 grams of ag with excess hno3.

i'm not sure how to plug in the grams of silver into an equation using moles to find how many moles are produced.

c. calculate the number of grams of agno3 produced by the reaction of 108 grams of ag with excess hno3

d. calculate the number of moles of no produced as a byproduct of the reaction of 108 grams of ag with excess hno3.

e. calculate the number of grams of no produced as a byproduct starting with 108 grams of ag and excess hno3.

explanation:

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Calculate the number of grams of fe2o3 needed to react with 19.0 g c....

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