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ella [17]
2 years ago
5

Aqua regia, a mixture of concentrated HNO₃ and HCl, was developed by alchemists as a means to "dissolve" gold. The process is a

redox reaction with this simplified skeleton reaction: \mathrm{Au}(s)+\mathrm{NO}_{3}^{-}(a q)+\mathrm{Cl}^{-}(a q) \longrightarrow \mathrm{AuCl}_{4}^{-}(a q)+\mathrm{NO}_{2}(g) (b) What are the oxidizing and reducing agents?
Chemistry
1 answer:
pav-90 [236]2 years ago
6 0

a) Balanced equation;

Au +3 NO^{-}  _{3} +4Cl^{- }+6H^{+} ⇒ AuCl^{-}_{4}  + 3NO_{2} + 3H_{2} O

b) oxidizing agent: N

    reducing agent: Au

a) The unbalanced redox equation is as follows:

Au + NO^{-}  _{3} +Cl^{- }+H^{+} ⇒ AuCl^{-}_{4}  + NO_{2} + H_{2} O

Balance all atoms other than H and O.

Au + NO^{-}  _{3} +4Cl^{- }+H^{+} ⇒ AuCl^{-}_{4}  + NO_{2} + H_{2} O

The oxidation number of gold changes from 0 to +3. The change in the oxidation number of gold is 3.The oxidation number of nitrogen changes from +5 to +4. The change in the oxidation number of nitrogen is 1.

So,

Au +3 NO^{-}  _{3} +4Cl^{- }+H^{+} ⇒ AuCl^{-}_{4}  + 3NO_{2} + H_{2} O

Now balance O atoms on RHS,

Au +3 NO^{-}  _{3} +4Cl^{- }+H^{+} ⇒ AuCl^{-}_{4}  + 3NO_{2} + 3H_{2} O

Now, balance hydrogen atoms on RHS,

Au +3 NO^{-}  _{3} +4Cl^{- }+6H^{+} ⇒ AuCl^{-}_{4}  + 3NO_{2} + 3H_{2} O

This is the balanced chemical equation.

b) oxidizing agent: N

    reducing agent: Au

Learn more about oxidation number here;

brainly.com/question/12854037

#SPJ4

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Which of the following statements is not true regarding acids? (3 points)
horsena [70]

Answer:

Lewis acid is a substance that donates a lone-pair of electrons.

Explanation:

What is said in the statement corresponds to a Lewis base, not an acid. For example, NH3 is a Lewis base, since it is capable of donating its pair of electrons. Trimethylborane (Me3B) is a Lewis acid, since it is capable of accepting a solitary pair.

8 0
3 years ago
Read 2 more answers
If the reactants have a potential energy of 10.2 kJ/mol and the products have a potential
Citrus2011 [14]

Answer:

The ΔH is 5.5 kJ/mol and the reaction is endothermic.

Explanation:

To calculate the ∆H (heat of reaction) of the combustion reaction, that is, the heat that accompanies the entire reaction, you must make the total sum of all the heats of the products and of the reagents affected by their stoichiometric coefficient ( number of molecules of each compound participating in the reaction) and finally subtract them:

Combustion enthalpy = ΔH = ∑H products - ∑Hreactants

In this case:

ΔH = 15.7 kJ/mol - 10.2 kJ/mol= 5.5 kJ/mol

An endothermic reaction is one whose enthalpy value is positive, that is, the system absorbs heat from the environment (ΔH> 0).

<u><em>The ΔH is 5.5 kJ/mol and the reaction is endothermic.</em></u>

4 0
3 years ago
Which solution has the greatest buffer capacity? Select the correct answer below: 1 mole of acid and 1 mole of base in a 1.0 L s
Lorico [155]

Answer:

The answer is

Explanation:

1 mole of acid.

Hope this helps....

Have a nice day!!!!

8 0
3 years ago
How many molecules make up 8.41 moles of Ca2(SO3)?
sammy [17]

Answer:

<h3>5.06282 × 10²⁴ molecules</h3>

Explanation:

The number of molecules of Ca2(SO3) can be found by using the formula

<h3>N = n × L</h3>

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 8.41 × 6.02 × 10²³

We have the final answer as

<h3>5.06282 × 10²⁴ molecules</h3>

Hope this helps you

3 0
2 years ago
In 3–5 sentences, explain why electrical wires are often constructed from metal coated with rubber, and how that is similar to m
stich3 [128]

Answer:

Covering electrical wires in plastic guarantees that the electrons flowing through the wires will not flow through your body when the wire is touched.

Explanation:

"The purpose of insulation covering the metal part of an electrical wire is to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors."

https://www.allaboutcircuits.com/worksheets/wire-types-and-sizes/#:~:text=Most%20electrical%20wire%20is%20covered,or%20plastic%20coating%20called%20insulation.&text=The%20purpose%20of%20insulation%20covering,current%20through%20those%20other%20conductors.

https://www.hunker.com/13414152/why-are-electrical-wires-covered-in-plastic

7 0
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