1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
sergejj [24]
1 year ago
13

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) (a) Balance the reaction by the half-reaction method.
Chemistry
1 answer:
Verizon [17]1 year ago
4 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

You might be interested in
PLEASE HELP AGAIN lol thank you :))
Annette [7]
BBBBBBBBBBBBBBBBBBBBBBBBBBBBB
8 0
3 years ago
Which set of chemical name and chemical formula for the same compound is correct??
Kruka [31]
The correct answer to your question is: <span>C) tin (IV) bromide, SnBr₄</span>
5 0
3 years ago
Describe the many different forms of energy involved with stretching and releasing a rubber band. What other processes are simil
Nadya [2.5K]

Answer:

Conversion of kinetic energy to potential energy (chemo mechanical energy)

In the state of rest, the rubber is a tangled mass of long chained cross-linked polymer that due to their disorderliness are in a state of increased entropy. By pulling on the polymer, the applied kinetic energy stretches the polymer into straight chains, giving them order and reducing their entropy. The stretched rubber then has energy stored in the form of chemo mechanical energy which is a form of potential energy

Conversion of the stored potential energy in the stretched to kinetic energy

By remaining in a stretched condition, the rubber is in a state of high potential energy, when the force holding the rubber in place is removed, due to the laws of thermodynamics, the polymers in the rubber curls back to their state of "random" tangled mass releasing the stored potential energy in the process and doing work such as moving items placed in the rubber's path of motion such as an object that has weight, w then takes up the kinetic energy 1/2×m×v² which can can result in the flight of the object.

Explanation:

5 0
3 years ago
Read 2 more answers
1. Ethanol has a density of 0.800 g/mL. <br> What is the mass of 225 mL of ethanol?
ziro4ka [17]

Answer: I have no clue.

Explanation:

45.0

4 0
3 years ago
What is the specific heat capacity of a metal if it requires 177.5 J to change the temperatures of 15.0g of the metal from 25.00
Vikentia [17]

Answer:

The specific heat capacity of a metal is 1.31 J/g°C = C

Explanation:

A classical excersise of calorimetry to apply this formula:

Q = m . C . ΔT

177.5 J = 15 g . C (34°C - 25°C)

177.5 J = 15g . 9°C . C

177.5 J /15g . 9°C = C

1.31 J/g°C = C

3 0
3 years ago
Other questions:
  • Alan's go-kart travels 1750 feet per minute, and Barry's go-kart travels 21 miles perhour. Who's go-kart travels faster?
    6·1 answer
  • What is the difference between alectronegativity and ioniztion energy
    8·1 answer
  • What is the kinetic energy of a 150 kg object that is moving with a speed of 15 m/s
    13·2 answers
  • 825 mL sample of an unknown HClO4 Solution requires titration with 22.62 mL of 0.2000 M NaOH to reach the equivalence point. Wha
    15·1 answer
  • assume that a water balloon has the same number of water molecules as a helium balloon has helium atoms. If the mass of the wate
    11·1 answer
  • If there are 2.54cm in an inch , how many inches are in 14.8cm?
    12·2 answers
  • Speed.
    15·1 answer
  • A 13.9 - g piece of metal ( specific heat capacity is 0.449 /g^ C)who whose temperature is 54.2 degrees * C was added to a sampl
    14·1 answer
  • Nono noonobbvyubojikkhbjhbjhb mj bk n
    6·1 answer
  • Atomic number of iron
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!