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viktelen [127]
3 years ago
11

One of the half-reactions for the electrolysis of water is 2H+(aq) + 2e− → H2(g) If 0.845 L of H2 is collected at 25°C and 782 m

mHg, how many faradays of electricity had to pass through the solution?
Chemistry
1 answer:
DENIUS [597]3 years ago
8 0

0.0725 faradays of electricity had to be passed through the solution.

Explanation:

Find how many hydrogen moles are produced.

1 mole of any gas consumes 24 liters at room temperature  

atmospheric pressure 1 environment is 760 mm Hg  

temperature is 25 deg C  

so if you reduced the pressure down to 760 mm Hg on that 0.845 liters you've gathered, you would discover the volume expanded to  

0.845 x 782/760 = 0.869 liters  

which equals to 0.0362 moles (divide by 24)  

since every atom of hydrogen required 2 electrons to be made, hence we need 0.0725 moles of electrons or 0.0725 faradays.

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a CUT stands for Circuit Under Test.

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A liquid has a density of 1g/mL. If you have 50mL of the liquid, what would its mass be?
Svetlanka [38]

Answer:

<h2>The answer is 50 g</h2>

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

<h3>mass = Density × volume</h3>

From the question

volume of liquid = 50 mL

density = 1g/mL

The mass of the liquid is

mass = 50 × 1

We have the final answer as

50 g

Hope this helps you

8 0
2 years ago
Which reaction will most likely take place based on the activity series? Li &gt; K Ba CaNa &gt; Mn &gt; Zn &gt; Cr&gt; Fe&gt; Cd
allsm [11]

Answer:

Among the given reactions,

a. Ag+FeCl 3

b, Zn + CaO

C. Ba+Na 2 CO 3

d . Cr+KNO3

which reaction is likely to take place based on the reactivity series?

Explanation:

The metal reactivity series is:

Li > K> Ba >Ca>Na > Mn > Zn > Cr> Fe> Cd Ni > H > Sb > Cu > Ag > Pd > Hg > Pt

The highly reactive metal will displace the less reactive metal from its compound during a displacement reaction.

a. Ag+FeCl 3

Ag is less reactive than Fe, so Ag cannot displace Fe from its compound.

This reaction also does not occur.

b, Zn + CaO

Zn is less reactive than Ca, so it cannot displace Ca from its compound.

This reaction does not occur.

C. Ba+Na 2 CO 3

Ba is more reactive than Na, so Ba displaces Na from its compound.

This reaction is possible.

d . Cr+KNO3

Cr is less reactive than K, so it cannot displace K from its compound.

Hence, This reaction is not possible.

Answer:

option c) Ba+Na 2 CO 3 -> BaCO3 +2Na

5 0
3 years ago
Select the statements that correctly describe a buffer. a) An acid added to the buffer solution reacts with the weak base of the
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Answer:

  • <em>(B.) The pH of a buffer solution is determined by the ratio of the concentration of conjugate base to the concentration of strong acid.</em>
  • <em>(C.) A buffer is generally made up of a weak acid and its conjugate base. </em>
  • <em>(D.) The pH of a buffer solution does not change significantly when any amount of a strong acid is added.</em>

Explanation:

A buffer is  solution which resists change in pH upon addition of either acids or bases.

The pH of a buffer is calculated by the ratio of the concentration  of base to concentration of acid. The weak acid and conjugate base have a Ka similar to the pH desired.

3 0
2 years ago
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