All Questions
Tagged with chemical-formula organic-chemistry
11
questions
2
votes
1
answer
46
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What does ‘S/A’ mean in SMARTS pattern when using Chemicalize to draw the chemical structure?
I am still new to the SMARTS annotation. I am wondering what does S/A’ mean on the bond labeling drawn with Chemicalize using SMARTS [!#1]c1n[cH]nc([!#1])c1[!#1]? ...
- 131
3
votes
1
answer
197
views
What does ‘(A)’ mean in SMARTS pattern when using Chemicalize to draw the chemical structure?
I am not quite sure what ‘(A)’ could mean for the carbon atom when writing the SMARTS CCN(C)C using Chemicalize to draw the chemical structure below. Can anyone ...
- 131
2
votes
3
answers
130
views
Minimum molar mass of organic compound with given mass fraction of carbon
Problem from my coaching module:
An organic compound X contains 10% C by mass. The minimum molar mass of compound X is (in g/mol)
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I think the compound must have an integer amount of ...
- 828
3
votes
1
answer
124
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Glutaraldehyde or Glutardialdehyde
Recently I was searching for a chemical compound to meet my research needs, i.e. glutaraldehyde, and later I found that Merck has been released different name of compound: (1) glutaraldehyde and (2) ...
-2
votes
1
answer
133
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Resorcinol turned brown [closed]
I stored resorcinol in a transparent plastic container with an airtight lid. There was some air captured inside the container too. After some days, it turned brown. please tell what happened to it?
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1
vote
0
answers
84
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How to get the total number of numbered positions in a molecule/compound
I'm working on a metabolite database where "labeled" compounds can contain isotopically labeled atoms in specific positions. When a new labeled compound is entered into the database, we'd ...
- 119
0
votes
0
answers
80
views
How do I calculate the empirical formula when ash is present in the percentage composition?
I am trying to calculate a chemical formula. How do I calculate the empirical formula when ash is present in the percentage composition?
Example-
C- 47.7%
H- 7.2%
N- 1.8%
S- 0.9%
O- 38.0%
Ash- 4.4%
...
- 23
0
votes
0
answers
31
views
How can the multiplicative number (n) of a chemical series like polyethylene glycol (PEG) be a non-integer?
https://en.m.wikipedia.org/wiki/PEG_400
Down at chemical or molecular formula, it says:
C_2n H_4n+2 O_n+1, like for all polyethylene glycols (PEG)s, but then says n=8.2 to 9.1....
Huh?
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-5
votes
1
answer
3k
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What is the chemical formula of ghee? [closed]
What is the chemical formula of ghee (Indian butter)? Also, name the elements present and state the number of their atoms.
2
votes
0
answers
130
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How to use NMR readings to determine the molecular structure of a compound? [closed]
A question in my exam came as follows:
How is NMR used in the determination of structure of organic compounds?
I have studied NMR spectroscopy and I know how to determine values using an NMR ...
1
vote
0
answers
443
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The equation representing the dissolution of cycasin [closed]
Is the following equation correct?
$$\ce{{C_8H_{16}N_2O_7}_{(s)} + H2O_{(l)} <=> {C_8H_{16}N_2O_7}_{(aq)}}$$
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