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Nadya [2.5K]
2 years ago
14

A.Characterize each of the following as

Chemistry
1 answer:
kondor19780726 [428]2 years ago
8 0

According to the Bohr model, an absorption occurs when an electron moves from a lower to a higher energy level and emission occurs when an electron moves from a higher to a lower energy level.

Following the Bohr model, electrons are found in certain specific energy levels. When an electron moves from one energy level to another, energy may be absorbed or emitted.

Movement from a higher to a lower energy level means that energy is emitted while movement from a lower to a higher energy level means that energy is absorbed.

Based on this, we can now sort the transitions as follows;

E2 to E1 -----  emission

E1 to E3 ------- absorption

E6 to E3 ------- emission

Learn more: brainly.com/question/3964366

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Kipish [7]

Answer: 72 grams of O_2(g) are needed to completely burn 19.7 g C_3H_8(g)

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number 6.023\times 10^{23} of particles.

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Putting in the values we get:

\text{Number of moles}=\frac{19.7g}{44g/mol}=0.45moles

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0.45 moles of C_3H_8 require= \frac{5}{1}\times 0.45=2.25 moles of oxygen

Mass of O_2=moles\times {\text {Molar mass}}=2.25\times 32=72g

72 grams of O_2(g) are needed to completely burn 19.7 g C_3H_8(g)

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