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Gnoma [55]
2 years ago
13

PLEASE HELP ME ASAP!!!!

Chemistry
1 answer:
VashaNatasha [74]2 years ago
4 0

Answer:

16.   CsCl  =  Cs¹⁺ and Cl⁻¹

17.  CaF₂  =  Ca²⁺ and F⁻¹

18.   FeO  =  Fe²⁺ and O⁻²

19. Al₂O₃  =  Al³⁺ and O⁻²

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How much heat is absorbed/released when 20.00 g of NH3(g) (17.0307g/mol) react in the presence of excess O2(g) to produce NO(g)
irina1246 [14]

Answer:

342.8 kJ are absorbed

Explanation:

In the reaction:

4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(l) ΔH° = 1168 kJ

<em>As ΔH > 0, the heat is absorbed. Also, when 4 moles of NH3 are involved in the reaction, there are absorbed 1168 kJ</em>.

Having this in mind, moles of NH3 in 20.00g are:

20.00g × (1mol / 17.0307g) = <em>1.174 moles</em>

<em></em>

Thus, 1.174 moles of NH3 absorbed:

1.174 moles × (1168 kJ / 4 moles) = <em>342.8 kJ are absorbed</em>.

8 0
4 years ago
The Earth's circumference around the equator is slightly bulged as compared to the circumference around the poles. if the circum
Igoryamba
The earth in m is 510
5 0
4 years ago
what is the coordination number of cobalt in [co(nh3)5cl](no3)2? what is the coordination number of cobalt in [co(nh3)5cl](no3)2
rewona [7]

The coordination number of cobalt in the complex is 6.

What is coordination compound?

The number of ligands attach to the central metal atom or ion in coordination sphere is coordination number.

In given complex 5 NH3 and 1 chlorine is attached in coordination sphere, so coordination number is 6.

To know more about the coordination number please follow the link:

https://brainly.in/question/1115267

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5 0
1 year ago
How many grams of NaOH do you need to dissolve to make 1.55 Liters of a 1.55 Molar solution?
ale4655 [162]

Answer:

Mass = 96g

Explanation:

Molarity = number of moles/volume of solvent

According to the provided information, volume = 1.55L, Molarity = 1.55M

number of moles (n) = molarity × volume

n = 1.55 × 1.55

n = 2.4025

n = 2.40mol

For NaOH, molar mass = 23 + 16 + 1 = 40g/mol

mole = mass/molar mass

Mass = molar mass × mole

Mass = 40 × 2.40

Mass = 96g

6 0
3 years ago
How many atoms are found in a 15.5 g sample of bismuth?
r-ruslan [8.4K]

Answer:

4.47 x 10²² atoms

Explanation:

Given parameters:

Mass of Bismuth  = 15.5g

Unknown:

Number of atoms  = ?

Solution:

To find the number atoms, first solve for the number of moles in this element first.

  Number of moles  = \frac{mass}{molar mass}    

  Number of moles  = \frac{15.5}{209}    = 0.074mole

So:

        1 mole of a substance contains 6.02 x 10²³ atoms

     0.074 mole of Bismuth will contain 0.074 x 6.02 x 10²³ atoms

                                                          = 4.47 x 10²² atoms

6 0
3 years ago
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