Chemistry, 11.01.2020 07:31 sandywarren8789

I’m so confused on how to balance all these equations!

Answers: 1

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Answers

Answer from: carlossauceda0

Explanation:

Synthesis Reaction:

The reaction in which two or more molecules or compound combine together to form a new compound.

1. K + Cl₂ > KCl

Balanced equation

2 K + Cl₂ >2 KCl

2. Ca + F₂ > CaF₂

Balanced equation

Ca + F₂ > CaF₂

3. Ag + S > AgS

Balanced equation

2Ag + S > Ag₂S

4. Na + I₂ > NaI

Balanced equation

2 Na + I₂ > 2 NaI

5. Mg + O₂ > MgO

Balanced equation

2 Mg + O₂ > 2 MgO

6. H₂ + Cl₂ > HCl

Balanced equation

H₂ + Cl₂ > 2 HCl

Decomposition reaction:

when one compound breaks down into 2 or more molecule or components.

7. Cs₂O > Cs + O₂

Balanced equation

2 Cs₂O > 4 Cs + O₂

8. H₂O > H₂ + O₂

Balanced equation

2 H₂O > 2 H₂ + O₂

9. MgBr₂ > Mg + Br₂

Balanced equation

MgBr₂ > Mg + Br₂

10. AlCl₃ > Al + Cl₂

Balanced equation

2 AlCl₃ > 2 Al + 3 Cl₂

11. KI > K + I₂

Balanced equation

2 KI > 2K + I₂

12. NaCl > Na + Cl₂

Balanced equation

2 NaCl > 2 Na + Cl₂

Combustion:

when a fuel burn in the presence of oxygen and produces carbon dioxide and water.

13. C₃H₈ + O₂ > CO₂ + H₂O

Balanced equation

C₃H₈ + 5 O₂ > 3 CO₂ + 4 H₂O

14. C₂H₄ + O₂ > CO₂ + H₂O

Balanced equation

C₂H₄ + 3 O₂ > 2 CO₂ + 2 H₂O

Answer from: Quest

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = $25^oc$ = 298 k $)0^oc=273kelvins$

$o_3+3no\rightarrow 3no_2,\delta h_{reaction}=? [/)</p><p>[tex]\delta h_{no}=90.4kj/mol$

$\delta h_{no_2}=33.85kj/mol$

$\delta h_{o_3}=142.2kj/mol$

$\delta h_{reaction}=\sum \delta h_{products}-\sum\delta h_{reactants}=3\times\delta h_{no_2}-(3\times \delta h_{no}+\delta h_{o_3})$

$\delta h_{reaction}=33.85-(90.4+142.2)=-311.85kj/mol$

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

$v_{no}=12.00 l,v_{o_3}=8.50 l$

$pv_{no}=n_{no}rt=1atm \times 12.00 l=n_{no}\times 0.0821 atml/k mol \times 298 k$

$n_{no}=0.49 moles$

$pv_{o_3}=n_{o_3}rt=1atm \times 8.50 l=n_{o_3}\times 0.0821 atml/k mol \times 298 k$

$n_{o_3}=0.34 moles$

according to reaction 3 moles no are reacting with 1 mol of $o_3$ ,then 0.49 mol of no will react with $\frac{1}{3}\times 0.49$ moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and $o_3$ is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

$\delta h_{reaction}\times \text{moles of no}=-311.85kj/mol\times 0.49 mol=-152.80kj/mol$

Answer from: Quest

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.

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