When a molecule absorbs IR electromagnetic energy, what are the vibrational modes affected? Select one or more correct answers.
1 answer:
Answer:
Stretching and bending vibrational modes are affected
Explanation:
Frequency region for IR (infra red) radiation is 4000-400
Stretching and bending frequencies of covalent bonds in a molecule lies within range of IR radiation.
When a molecule is excited with IR radiation, frequencies related to stretching and bending mode of covalent bond resonates with incoming frequency of radiation by obeying some certain quantum mechanical selection rule.Therefore we can identify those stretching/bending mode and thereby identify a particular covalent bond.
So, option (C) and (D) are correct
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The answer for the following problem is mentioned below.
- <u><em>Therefore number of molecules(N) present in the calcium phosphate sample are 19.3 × 10^23 molecules.</em></u>
Explanation:
Given:
mass of calcium phosphate ( ) = 125.3 grams
We know;
molar mass of calcium phosphate ( ) = (40×3) + 3 (31 +(4×16))
molar mass of calcium phosphate ( ) = 120 + 3(95)
molar mass of calcium phosphate ( ) = 120 +285 = 405 grams
<em>We also know;</em>
No of molecules at STP conditions() = 6.023 × 10^23 molecules
To solve:
no of molecules present in the sample(N)
We know;
N÷
=
N =(405×6.023 × 10^23) ÷ 125.3
N = 19.3 × 10^23 molecules
<u><em>Therefore number of molecules(N) present in the calcium phosphate sample are 19.3 × 10^23 molecules</em></u>