Question
Asked Jan 19, 2019
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I am not sure how to work this problem.

write the molecular formula for a compound with the possible elements C, H, N and O that exhibits a molecular ion at Mr-84.0948.
Exact Masses of the Most Abundant Isotope of
Selected Elements
Isotope Natural abundance (%)
H 99.985
1c98.90
14N99.63
Exact mass
1.008
12.000
14.003
15.995
99./6
Molecular formula C4H6NO
X
(In the order CHNO, with no subscripts)
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write the molecular formula for a compound with the possible elements C, H, N and O that exhibits a molecular ion at Mr-84.0948. Exact Masses of the Most Abundant Isotope of Selected Elements Isotope Natural abundance (%) H 99.985 1c98.90 14N99.63 Exact mass 1.008 12.000 14.003 15.995 99./6 Molecular formula C4H6NO X (In the order CHNO, with no subscripts)

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Expert Answer

Molecular mass is even (84.0948 or 84)

Using nitrogen rule.

When nitrogen (N) is present in even number, molecular mass is even.

Case 1: If N = 0, then

 O = 16 x 1 = 16

C = 12 x 5 = 60

H = 8 x 1 = 8

Molecular formula = C5H8O

Case 2: If N = 0, then

O = 2 x 16 = 32

C ...

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