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Soloha48 [4]
3 years ago
7

Both Jacques Charles and Joseph Louis Guy-Lussac were avid balloonists. In his original flight in 1783, Jacques Charles used a b

alloon that contained approximately 31100 L of H2. He generated the H2 using the reaction between iron and hydrochloric acid: Fe(s)+2HCl(aq)→FeCl2(aq)+H2(g)
How many kilograms of iron were needed to produce this volume of H2 if the temperature was 21 ∘C? (For simplicity, assume that the pressure experienced by the balloon will be 1.00 atm.)
Chemistry
1 answer:
daser333 [38]3 years ago
3 0

Answer:

m_{Fe}=71.982 kg

Explanation:

First of all, we need  to calculate the moles of H2. Assuming the H2 is an ideal gas:

n=\frac{P*V}{T*R}

n=\frac{1atm*31100L}{294K*0.082 L*atm*mol^{-1}*K^{-1}}

n=1290 mol

Now, to produce 1 mol of H2 is required 1 mol of Fe:

m_{Fe}=n*M=1290mol*\{55.8 g}{mol}

m_{Fe}=71982 g=71.982 kg

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What is oxidized in a galvanic cell with aluminum and gold electrodes ?
k0ka [10]

Answer:

Aluminum metal

Explanation:

In order to properly answer this or a similar question, we need to know some basic rules about galvanic cells and standard reduction potentials.

First of all, your strategy would be to find a trusted source or the table of standard reduction potentials. You would then need to find the half-equations for aluminum and gold reduction:

Al^{3+}+3e^-\rightarrow Al; E^o=-1.66 V

Au^{3+}+3e^-\rightarrow Au; E^o=1.50 V

Since we have a galvanic cell, the overall reaction is spontaneous. A spontaneous reaction indicates that the overall cell potential should be positive.

Since one half-equation should be an oxidation reaction (oxidation is loss of electrons) and one should be a reduction reaction (reduction is gain of electrons), one of these should be reversed.

Thinking simply, if the overall cell potential would be obtained by adding the two potentials, in order to acquite a positive number in the sum of potentials, we may only reverse the half-equation of aluminum (this would change the sign of E to positive):Al\rightarrow Al^{3+}+3e^-; E^o=1.66 V\\Au^{3+}+3e^-\rightarrow Au; E^o=1.50 V

Notice that the overall cell potential upon summing is:

E_{cell}=1.66 V + 1.50 V=3.16 V

Meaning we obey the law of galvanic cells.

Since oxidation is loss of electrons, notice that the loss of electrons takes place in the half-equation of aluminum: solid aluminum electrode loses 3 electrons to become aluminum cation.

6 0
3 years ago
Which statement is true of magnets
Harrizon [31]

The statement that is true about magnets is ''Similar poles of a magnet repel each other.''

<h3>What are the characteristics of magnet?</h3>

All magnets have both north and south poles. Opposite poles attract each other, whereas the similar poles repel each other. When you rub a piece of iron along a magnet, this force creates a magnetic field.

So we can conclude that The statement that is true about magnets is ''Similar poles of a magnet repel each other.''

Learn more about magnet here: brainly.com/question/14997726

#SPJ1

4 0
2 years ago
Which major changes in human society and the environment occurred during the Industrial Revolution? *
wariber [46]

Answer: c

Explanation:

during the industrial revolution americans were switching from rural to urban life, thus using up more fossil fuels, and working in factories

7 0
3 years ago
Biological specimens are often examined by microscopy. However, microscopy with visible light is limited to viewing details of a
Alborosie

Answer:

(a) Wavelength = 4.85 x 10^-12 m

(b) Maximum uncertainty = 5.27*10^-25 kgm/s

Explanation:

(a)  Calculating the wavelength using the formula;

      λ= h/p

but p = mv

Where;

m = mass of electron = 9.1 x 10-31

h = 6.625 x 10^-34

      = h/mv

       = 6.625 x 10^-34 / (9.1 x 10^-31 x 1.5×10^8)

  = 4.85 x 10^-12 m

so, the wavelength is short enough to reveal molecular details at the atomic level.

(b) Find attached of part b

6 0
3 years ago
Brainliest to right answer
sashaice [31]
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