The order of decreasing energy is ultraviolet rays, infrared rays, and microwaves.
Frequency is defined as the number of occurrences of the event. In wave function, frequency is the number of times the given waveform passes through a given point. The SI unit of frequency is Hertz.
Photons are particles that do not contain mass but possess energy. Photon energy is calculated by the formula Planck's constant h ( 6.63✖10-34 J/s) multiplied by the frequency. Hence frequency is directly proportional to the energy of the photon.
Higher frequency waves will have higher energy. Lower frequency waves will have lower energy.
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Rank the following photons in terms of decreasing energy:
(a) IR (v = 6.5 x 10¹³ s⁻¹)
(b) microwave (v = 9.8 x 10¹¹ s⁻¹)
(c) UV (v = 8.0 x 10¹⁵ s⁻¹)
The units for measuring ions, molecules or atoms are called moles. Water decomposes to form hydrogen and oxygen as follows:
Moles of hydrogen produced will be:
Option C. 12.6 mol
The moles can be estimated as:
- The molar ratios can be written as:
2 mol : 2 mol : 1 mol
- The proportions and theoretical values are written as:
Let the moles of = X
Then,
From this it can be depicted that hydrogen produced is double compared to oxygen produced.
Solving further for X:
Therefore, 12.56 moles are produced of hydrogen.
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The atomic number of an atom containing 29 protons, 29 electrons, and 34 neutrons is 29.
The atomic number of copper is 29, and it has a mass number of 63. The mass number is generally equal to the sum of the protons as well as neutrons within the nucleus, while the atomic number refers to the count of the nucleus's protons. This indicates that the nucleus of the copper atom contains 34 neutrons as well as 29 protons, for a total of 63 protons.
The charge number of such an atomic nucleus would be the chemical element's atomic number, also known as the nuclear charge number. This is equivalent to the proton number, or even the quantity of protons present in the nucleus of each atom of a particular element, for conventional nuclei.
Therefore, the atomic number of an atom containing 29 protons, 29 electrons, and 34 neutrons is 29.
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Final temperature if the average specific heat capacity of the products is 2.5 J/g·°C is 1302.57°C
Given reaction:
C₂H₄O(g) → CH₄(g) + CO(g)
Now,
Given data for this reaction is :
ΔH°f =-77.4 kJ/mol
ΔH°vaporization =569.4 J/g
= 569.4J/g × 44.0g/mol
ΔH°vaporization= 25.082 kJ/mol
Now,
ΔH°vaporization = H(vapor) - H(liquid)
25.082 = H(vapor) + 77.4 kJ/mol
H(vapor) = -52.318 kJ/mol
Again,
ΔH°rxn = ( H( CO(g))) + (H(CH₄(g))) - (H( C₂H₄O(g)))
= -110.5 - 74.87 + 52.318
ΔH°rxn = -133.053 kJ/mol
Now,
Given
T₁= 93°C = 366K
We know that,
Q= mcΔT
133.053 × 10³ = 44 × 2.5 × (T₂ - 93)
T₂ = 1302.57°C
Thus, from the above conclusion we can say that , Final temperature if the average specific heat capacity of the products is 2.5 J/g·°C is 1302.57°C .
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