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Georgia [21]
3 years ago
10

1. The emission spectrum of mercury atoms has a bright green line with wavelength

Chemistry
1 answer:
SashulF [63]3 years ago
5 0

Emission spectrum results from the movement of an electron from a higher to a lower energy level. The frequency of the photon is 5.5 * 10^14 Hz.

From the formula;

E = hc/λ

h = Plank's constant =6.6 * 10^-34 Js

c = speed of light=  3 * 10^8

λ = wavelength = 546.1 * 10^-9 m

E =  6.6 * 10^-34 * 3 * 10^8/546.1 * 10^-9

E =3.63 * 10^-19 J

Also;

E =hf

Where;

h = Planks's constant

f = frequency of photon

f = E/h

f = 3.63 * 10^-19 J/6.6 * 10^-34

f = 5.5 * 10^14 Hz

Learn more: brainly.com/question/18415575

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How many moles of isooctane must be burned to produce 100 kJ of heat under standard state condaitions?
kodGreya [7K]

Answer:

0.018 moles of isooctane must be burned to produce 100 kJ.

Explanation:

When the isooctane is <em>burned</em>, it undergoes a reaction known as combustion, in which reacts with oxygen to produce carbon dioxide and water. In standard conditions (Pressure = 1 atm and Temperature = 298 K) formed water is liquid. The balanced equation is:

C₈H₁₈(l) + 12.5 O₂(g) ⇄ 8 CO₂(g) +  9 H₂O(l)

The standard enthalpy of combustion (which can be found in tables) relates the amount of isooctane that reacts and the heat the reaction liberates. In this case, ΔH°c = -5,460 kJ/mol, that is every 1 mol of isooctane that burns, 5,460 kJ of heat are released.

We can begin with the information of 100 kJ and apply this conversion factor. Since this energy is released, by convention, we write it with a minus sign.

-100kJ.\frac{1mol (isooctane)}{-5,460kJ} =0.018 mol(isooctane)

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3 years ago
PLEASE HELP <br> What is the element dot structure for Li+1? Really confused about the +1 part.
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You must answer all questions to get credit for this assignment. Use the notes above and/or the textbook to help you find the an
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Explanation:

(1).  It is known that in a reaction equation, reactants are placed or written on left hand side and products are written on the right hand side.

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Hence, in a reaction equation you start with the reactants and end up with the products.

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