Answer:
1) a. 2Fe(s) + 3Cl₂(g) → 2FeCl₃(s).
2) a. 0.4477 mol.
b. 0.4477 mol.
c. 72.61 g.
Explanation:
1) Consider the following reaction: iron (s) + chlorine (g) à iron (III) chloride
<em>a. Write the balanced chemical equation.</em>
- The balanced equation should apply the law of conversation of mass that the no. of different atoms is equal in both sides of the reaction (reactants and products sides).
So, the balanced chemical equation is:
<em>2Fe(s) + 3Cl₂(g) → 2FeCl₃(s).</em>
It is clear that 2 mol of Fe(s) react with 3 mol of Cl₂(g) to produce 2 mol of FeCl₃(s).
<em>2) 25.0 g of iron reacts with excess chlorine gas. </em>
<em>a. Calculate the moles of iron reactant.</em>
- The no. of moles of Fe (n) can be calculated using the relation:
<em>n = mass/molar mass =</em> (25.0 g)/(55.845 g/mol) = <em>0.4477 mol.</em>
<em>b. Calculate the moles of iron (III) chloride.</em>
<em><u>Using cross multiplication:</u></em>
2 mol of Fe produce → 2 mol of FeCl₃, from stichiometry.
∴ 0.4477 mol of Fe produce → 0.4477 mol of FeCl₃.
∴ The no. of moles of iron (III) chloride produced is 0.4477 mol.
<em>c. Calculate the mass of iron (III) chloride.</em>
- We can calculate the mass of iron (III) chloride produced using the relation:
mass of iron (III) chloride = (no. of moles)*(molar mass) = (0.4477 mol)*(162.2 g/mol) = 72.61 g.
<u>Answer:</u> The 
for the reaction is -104.7 kJ.
<u>Explanation:</u>
Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.
According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.
The chemical equation for the formation of propane follows:
The intermediate balanced chemical reaction are:
(1) 
(2) 
( × 3)
(3) 
( × 2)
The expression for enthalpy of the reaction follows:
![\Delta H^o_{rxn}=[1\times (-\Delta H_1)]+[3\times \Delta H_2]+[2\times \Delta H_3]](https://tex.z-dn.net/?f=%5CDelta%20H%5Eo_%7Brxn%7D%3D%5B1%5Ctimes%20%28-%5CDelta%20H_1%29%5D%2B%5B3%5Ctimes%20%5CDelta%20H_2%5D%2B%5B2%5Ctimes%20%5CDelta%20H_3%5D)
Putting values in above equation, we get:
![\Delta H^o_{rxn}=[(1\times (-(-2043))+(3\times (-393.5))+(2\times (-483.6))]=-104.7kJ](https://tex.z-dn.net/?f=%5CDelta%20H%5Eo_%7Brxn%7D%3D%5B%281%5Ctimes%20%28-%28-2043%29%29%2B%283%5Ctimes%20%28-393.5%29%29%2B%282%5Ctimes%20%28-483.6%29%29%5D%3D-104.7kJ)
Hence, the for the reaction is -104.7 kJ.
Alkanes represent one family of organic compounds that is composed of carbon and hydrogen.
Alkanes are organic compounds that solely have hydrogen and carbon atoms in single bonds and do not have any additional functional groups. Alkanes can be divided into three groups: cycloalkanes, branched alkanes, and linear straight-chain alkanes.
The general formula for alkanes is CnH2n+2. Alkanes are also saturable hydrocarbons. Cyclic hydrocarbons like cycloalkanes have rings-shaped arrangements of their carbon atoms.
Therefore, Alkanes are an example of an organic chemical family made of carbon and hydrogen.
Learn more about alkanes here:
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Answer:
- Not balanced.
- Reactants: Zn and HCI
.
- Products: ZnCl₂ and H₂.
- Substitution reaction.
Explanation:
Hello,
In this case, for the given reaction:
Zn + HCI → ZnCl₂ + H₂
We can see that it is not balanced due to the fact that at the left side we have one hydrogen atom whereas at the right side two, taking into account the number must be same as well as chlorine. Thus, in order to balance we write:
Zn + 2HCI → ZnCl₂ + H₂
And that is enough. Moreover, we can see that the chemical species at the left side of the equation are the reactants and those at the right side the products, thus we have:
Reactants: Zn and HCI
.
Products: ZnCl₂ and H₂.
Finally, since we can see that the chlorine is at the reactants with hydrogen, but at the end with the zinc, and the initial zinc is alone as well as the yielded hydrogen we can infer this is a substitution reaction.
Best regards.
