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allochka39001 [22]
3 years ago
15

How many moles of NaOH are present in 27.5 mL of 0.270 M NaOH?

Chemistry
1 answer:
Naddik [55]3 years ago
8 0
The solution for the question above is:

C = 0.270 
<span>V = 0.0275L </span>
<span>n = ? </span>

<span>Use the molar formula which is: C = n/V </span>
<span>Re-arrange it to: n = CV </span>
<span>n = (0.270)*(0.0275) </span>
<span>n = 0.007425 mols </span>
<span>(more precise) n = 7.425 x 10^-3 mols
</span>
7.425 x 10^-3 mols is the answer.
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purification of chromium can be achieved by electrorefining chromium from an impure chromium anode onto a pure chromium cathode
stiv31 [10]

The chromium in the electrolytic solution is present as cr³⁺ will take 6.19 hours  will it take to plate 18.0 kg of chromium onto the cathode if the current passed through the cell is held constant at 45.0 A.

It is given that mass is 18 kg. Converting mass into grams

18 x (1000g / 1 kg)

= 18000 g

So, 18 kg = 18000 g

Now, calculate the number of moles

No. of moles = mass of Cr / molecular mass of Cr

No. of moles = 18000 / 52 g/mole

No. of moles = 346.15 mole

For , Cr³⁺, 3 moles of electrons are required

Hence,

3 x 346.15 mole

1038.45

As 96500 C of charge are present in 1 mole of electrons. As a result, the charge held by 1038.45 mole of electrons will be determined as follows.

= 1038.45mol x  96500 C / mole

= 10.02 x 10⁷ C

As, we know that relation between charge, current and time is as follows.

Q = I x T

Current is given as 45 A

Therefore, charge is calculated  

T = Q / I

T = 100.21 x 10⁶ / 45

T = 2.227 x 10⁶

As there are 3600 seconds in one 1 hour. Converting 2.227 x 10⁶ into hours are

= 2.227 x 10⁶ / 3600 sec/h

= 6.19 hours

Thus, if the current flowing through the cell is maintained constant at 45 A, we may estimate that it will take 6.19 hours to plate 18 kg of chromium onto the cathode.

To know more about  electrolytic solution visit :

brainly.com/question/9203208

#SPJ4

4 0
1 year ago
0.20dm
Alex_Xolod [135]

Answer:

I don't no sorry. ਕਿਉੁਂਕਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ 478figxigxurRyyv ਸ੍

5 0
3 years ago
Yvette mixed together water with calcium chloride in a beaker. She noticed that the temperature changed from 21oC to 37oC. She a
Rufina [12.5K]

Answer:

The temperature changed

5 0
2 years ago
Please help/show work!
Keith_Richards [23]

Answer:

7.00335g

Explanation:

n=\frac{V}{V_m} \\n = \frac{11.2}{22.4} \\n= 0.5 mol

n=\frac{m}{M} \\m=nM\\m=(0.5)(14.0067)\\m=7.00335g

3 0
2 years ago
Write the chemical equation that describes how calcium carbonate neutralizes acid
enyata [817]
<h3><u>Answer;</u></h3>

CaCO3(s)+ 2 H+(aq)  → Ca+2 + CO2(g) + H2O(l)

<h3><u>Explanation</u>;</h3>
  • The reaction of an acid with calcium carbonate is an example of an acid-base reaction.
  • In these reactions, an acid will react with a base to form a salt and water. The acid was neutralized by the base.
  • For example, CaCo3 will neutralize HCl by the following equation:

<em>2HCl(aq) +CaCO3(s) → CaCl2(aq) + H2O(l) + CO2(g)</em>

6 0
3 years ago
Read 2 more answers
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