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sveta [45]
3 years ago
15

How many atoms of chromium are in 0.86 mol of potassium chromate (K2CrO4)?

Chemistry
1 answer:
9966 [12]3 years ago
3 0
<h2>Answer:</h2>

Atoms of Cr in 0.86 mol of K2CrO4 = 0.86 × 6.02*10^23 = 5.177 * 10^23 atoms.

<h3>Explanation:</h3>
  • One mol of K2CrO4 contains 6.02*10^23 molecules of K2CrO4.
  • One K2CrO4  contains 1 atom of Cr.
  • So 0.86 mol of K2CrO4 contain 0.86 * 6.02*10^23.
  • Which is equal to  5.177 * 10^23 atoms.

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A plane takes 230 passengers from New York to Chicago in 3 hours.
devlian [24]

Answer:263mph

Explanation:

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2 years ago
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol.
Brut [27]

Answer:

<em>293.99 g </em>

OR

<em>0.293 Kg</em>

Explanation:

Given data:

Lattice energy of Potassium nitrate (KNO3) = -163.8 kcal/mol

Heat of hydration of KNO3 = -155.5 kcal/mol

Heat to absorb by KNO3 = 101kJ

To find:

Mass of KNO3 to dissolve in water = ?

Solution:

Heat of solution = Hydration energy - Lattice energy

                           = -155.5 -(-163.8)

                           = 8.3 kcal/mol

We already know,

1 kcal/mol = 4.184 kJ/mole

Therefore,

= 4.184 kJ/mol x 8.3 kcal/mol

= 34.73 kJ/mol

Now, 34.73 kJ of heat is absorbed when 1 mole of KNO3 is dissolved in water.

For 101 kJ of heat would be

= 101/34.73

= 2.908 moles of KNO3

Molar mass of KNO3 = 101.1 g/mole

Mass of KNO3 = Molar mass x moles

                         = 101.1 g/mole  x  2.908

                         = 293.99 g

                         = 0.293 kg

<em><u>293.99 g potassium nitrate has to dissolve in water to absorb 101 kJ of heat. </u></em>     

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3 years ago
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Answer:

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6 0
3 years ago
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Answer:

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Explanation:

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Ghella [55]

Answer:

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Explanation:

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2 years ago
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