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Questions tagged [chemical-formula]

For questions related to molecular formula, empirical formula, formula unit, representing the chemical proportions of atoms that constitute a particular chemical compound, molecule, ion, complex, crystal, etc. using chemical element symbols, numbers, and other symbols. NOT related to 'notation', 'composition', 'structure' or 'nomenclature'.

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What is the maximum number of water molecules that has been recorded till date to present as water of crystallization in a compound?

Context: I was casually looking through some old questions when I found this question. The OP wanted a compound that has all the hydrates ranging from monohydrate to decahydrate. I found chromium(III) ...
Nilay Ghosh's user avatar
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7 votes
1 answer
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How to understand the chemical formula of Prussian blue complex w.r.t its crystal structure?

Note: Just to be clear, I do not refer to "complex molecules" (i.e. "complex" as "complicated"), but to actual complexes. I am trying to understand the structure of ...
jng224's user avatar
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7 votes
1 answer
1k views

What is the chemical composition of Ferrous Ferrocyanide?

To this day, iron-cyanide complexes confuses me. So, I want to settle this once and for all. After scavenging the internet, I gathered the following result: $$ \ce{Ferr} \color{blue}{\ce{ous}}~\ce{...
Nilay Ghosh's user avatar
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6 votes
1 answer
100 views

Are atom coordinates in molfile necessary to produce a valid InChI identifier

I took this molfile of benzoic acid: ...
Paul Jurczak's user avatar
5 votes
1 answer
2k views

How can I mix methylene chloride, methanol and hydrofluric acid to make a paint stripper?

HF paint stripper on data sheets lists Methylene chloride 70>85% Methanol 10>25% Hydrofluric acid. 5% Previously I have found the chemical splits. Is there a particular method to ...
Will Randle's user avatar
4 votes
2 answers
332 views

Are there examples of molecular formulas with nested groups?

Sometimes a molecular formula is written using groups, for instance $\ce{Al2(SO4)3}$. Are there examples of formulas with nested groups, such as $\ce{ABC[MNO2(XYZ)4]3}$ or is this avoided?
xenoid's user avatar
  • 151
3 votes
1 answer
660 views

Empirical formula and rounding

I am very confused with the procedure to find the empirical formula. In the part where we have to multiply by subscripts to make them integers, are there clear rules? For example, if I have the ...
Diego's user avatar
  • 141
3 votes
1 answer
344 views

Can two positive ions be next to each other in a formula?

Let's say I want to find the oxidation numbers of the atoms in a chemical formula. For example: In $\ce{H3AsO3}$, Oxygen has a $-2$ charge. They're $3$ of them, so its $-6$ Hydrogen has a $+1$ ...
Mark's user avatar
  • 312
3 votes
1 answer
1k views

Chemical formula of a compound crystallized in a cubic lattice

Question In a cubic lattice of $\ce{XYZ},$ $\ce{X}$ atoms are present at all corners except one corner which is occupied by $\ce{Y}$ atoms. $\ce{Z}$ atoms are present at face centres. What is the ...
Always Learning Forever's user avatar
3 votes
1 answer
97 views

The formula of ammonium phosphomolybdate

It is written in my qualitative chemistry textbook that phosphate could be tested by introducing phosphate, nitric acid and ammonium molybdate which gives (NH4)3H4[P(Mo2O7)6]. I found out in the ...
Seiji's user avatar
  • 185
3 votes
1 answer
116 views

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) ...
Muhammad Ihsan's user avatar
3 votes
1 answer
5k views

Ratio of copper(II) ions to EDTA?

What is the ratio of copper(II) ions to EDTA in a $\ce{[Cu(EDTA)]^{2-}}$ complex? I know that EDTA forms up to 6 coordinate bonds with the central atom, but is that what they are asking for with "...
DK2AX's user avatar
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2 votes
1 answer
1k views

What's the difference between Zinc Ascorbate and Zinc Gluconate?

I've been looking at a dental product for pets, called MAXI/GUARD Oral Cleansing Gel and it states it uses zinc ascorbate/taurine, however in the ingredients I found elsewhere it instead lists zinc ...
Brett's user avatar
  • 49
2 votes
1 answer
560 views

Empirical and molecular formula

I was doing a homework assignment and I got the question wrong because I was supposed to multiply the empirical formula of $\ce{C6H10S2O}$ by 3 to get the molecular formula. I put $\ce{(C6H10S2O3)3}...
Ron's user avatar
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2 votes
3 answers
114 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) 100 120 150 200 I think the compound must have an integer amount of ...
Harikrishnan M's user avatar
2 votes
0 answers
145 views

What does fractional notation represent in molecular formulas such as SiO4/2 or H2SiO2/2?

I'm going through some papers about HSQ (hydrogen silsesquioxane) and keep seeing this fractional notation being used: HSiO3/2 , SiO4/2 , H2SiO2/2 , H3SiO1/2. Example paper. I understand that the ...
Victor Pantazi's user avatar
2 votes
0 answers
129 views

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 ...
Naved THE Sheikh's user avatar
1 vote
1 answer
1k views

Si(OH)4 vs. H4SiO4 vs. SiO2.2H2O

Can someone please explain to me what is the differences between $\ce{Si(OH)4}$, $\ce{H4SiO4}$, and $\ce{SiO2.2H2O}$? I am currently studying sandstone acidizing geochemical models and this question ...
Mohammad Khojastehmehr's user avatar
1 vote
1 answer
240 views

Using the mole ratio to figure out the molecular formula [closed]

It takes $\pu{8.0 cm^3}$ of aqueous sodium phosphate to fully react with $\pu{12.0 cm^3}$ of an aqueous solution of the nitrate of metal $\ce{T}$. If both solutions have a concentration of $\pu{1 mol ...
Shane's user avatar
  • 193
1 vote
1 answer
254 views

Finding formula of reduced scandium oxide using its mass and mass of obtained metal

An oxide of scandium, with a mass of $\pu{1.423 g},$ is chemically reduced with $\ce{H2}$ to give $\ce{H2O}$ and $\pu{0.929 g}$ of $\ce{Sc}$ metal. What is the formula of scandium oxide? How much ...
Alex's user avatar
  • 99
1 vote
2 answers
1k views

Combustion analysis of hydrocarbon

Combustion analysis of a hydrocarbon produced 33.01 g CO2 and 4.84 g H2O. I was asked to find the empirical formula of the hydrocarbon. I used these molar mass values for my calculations: C - 12.0107 ...
Captain Toad's user avatar
1 vote
0 answers
74 views

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 ...
hepcat72's user avatar
  • 119
1 vote
0 answers
20 views

What are the additional chemicals required to make polyurethane foam more viscoelastic? [closed]

I am currently experimenting with polyurethane forms for a science and research project I am working on. I need to make the polyurethane foam more viscoelastic, almost like memory foam. I am unable to ...
Samarth Karia's user avatar
1 vote
0 answers
31 views

Determining the number of triphenylphosphine ligands in nickel(II) complex

A complex is synthesised by combining hydrated solutions of $\ce{NiCl2}$ $(\pu{0.6 g})$ with $\pu{1.35 g}$ triphenylphosphine $(\ce{PPh3}).$ After cooling the product precipitates as a solid with ...
user avatar
1 vote
0 answers
50 views

Kinetics of Decomposition of Hydrogen Peroxide [duplicate]

Consider the decomposition of Hydrogen Peroxide: $$\ce{H2O2 -> H2O + 1/2O2}$$ The rate law for this reaction is : $$\text{Rate} = k[\ce{H2O2}]$$ Further $$\text{Rate} = -\frac{\mathrm d[\ce{H2O2}]}...
Tony Stark's user avatar
1 vote
0 answers
425 views

The equation representing the dissolution of cycasin [closed]

Is the following equation correct? $$\ce{{C_8H_{16}N_2O_7}_{(s)} + H2O_{(l)} <=> {C_8H_{16}N_2O_7}_{(aq)}}$$
Kyro's user avatar
  • 78
1 vote
0 answers
41 views

What is the materials science behind thermal diffusion in multispectral camouflage?

I've been interested in infrared and near-infrared camouflage (called multispectral camouflage) for a couple of days now, and I've found a video or two of certain companies that have created fabrics ...
August H's user avatar
0 votes
1 answer
134 views

How to write formula for potassium hydrogenpyrophosphite?

I know that pyrophosphite by itself is $\ce {({P_2}{O_5})^{4-}}$. My question is about the hydrogen part- how to know how many hydrogens to add? The answer key for this question says the compound is $\...
AVS's user avatar
  • 491
0 votes
3 answers
239 views

Is there a concise way to calculate pH of a solution after being diluted with water?

I do not have a chemistry degree or even much knowledge in the subject at all. I'm actually an auto detailer and this is why I have an interest in pH levels. All of our chemicals obviously have pH ...
Chris S.'s user avatar
0 votes
2 answers
1k views

Why is Pb3O4 called lead(II,IV) oxide?

We know that iron(II,III) oxide has the formula $\ce{Fe3O4}$ which is a combination of iron(II) oxide and iron(III) oxide with formulas $\ce{FeO}$ and $\ce{Fe2O3}$ respectively. So why isn't this the ...
user avatar
0 votes
1 answer
79 views

Separating Silica from silicates [closed]

Does anyone know how one could extract Silica $\ce{SiO2}$ from a one or more of the following compounds in either ground or powder forms? Plagioclase: $\ce{Ca2Al2Si2O8}$ Pyroxene: $\ce{(Ca,Mg,Fe)...
Mark Kelly's user avatar
0 votes
1 answer
122 views

How to find the empirical formula from mass percentages of oxides [closed]

Say you've given an element X and it makes two oxides. The first oxide is $X_\mathrm{4}O_\mathrm{6}$ and the mass percentage of oxygen is 43.7%. In the second oxide, the mass percentage of X is 43.7%. ...
Dulsara Dhanuka's user avatar
0 votes
1 answer
247 views

On basic mercury salts

$\ce{HgCO3.3HgO}$ and $\ce{HgO.Hg(NH2)Cl}$ are called basic mercury carbonate and basic mercury amidochloride, respectively. I found this thread on the former; I've only seen the latter as the product ...
harry's user avatar
  • 1,134
0 votes
1 answer
58 views

How to interpret this formula about hydrogen bond energy

I want to evaluate some chemistry related formulas, which I don't understand. In proteins, hydrogen bonding often occurs between the oxo group = O oxygen of one amino acid and the α-amino group (N − H)...
tomitheninja's user avatar
0 votes
1 answer
1k views

What is the chemical formula for the synthesis of Hydroxyapatite (Ca10(PO4)6(OH)2)?

This might be a basic question but I am a little confused. I have some lecture notes that says calcium phosphate ($\ce{Ca3(PO4)2}$) reacts with calcium hydroxide ($\ce{Ca(OH)2}$) to form ...
I have many questions's user avatar
0 votes
0 answers
74 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% ...
Aina Razali's user avatar
0 votes
0 answers
30 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?
Kurt Hikes's user avatar
  • 1,813
0 votes
0 answers
382 views

Chemical reaction of bronze tarnishing

Can anyone explain to me the chemical process of bronze tarnishing? According to Wikipedia: Bronzes are typically ductile alloys, considerably less brittle than cast iron. Typically bronze oxidizes ...
Mac_79's user avatar
  • 109
0 votes
0 answers
45 views

What is one formula unit? [duplicate]

I am really sorry if this is a beginner question but please still help me. In this website, which explains balancing chemical equations mentioned the word formula unit here: $\ce{3Ca(NO3)2}$ (just ...
Saifeldin Farid's user avatar
-1 votes
1 answer
293 views

How is Potassium present in Potato (form) and where does it come from originally? [closed]

I was going through the concept of Boiling to reduce the potassium in Potatoes, which means $\ce{potato + water +heat -> potassium + X}$. $\ce{X}$ is potato with reduced potassium. I am more ...
sundar's user avatar
  • 107
-1 votes
2 answers
61 views

Number of neutrons in a chemical question?

Consider the equation $\ce{H2 + H2+ -> H + H3+}$ What is the atomic structure of the $H_3^+$ ion? I understand that the H$_3^+$ ion contains 3 protons and 2 electrons. However, how many neutrons ...
Dano's user avatar
  • 9
-1 votes
1 answer
127 views

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?
Halidh's user avatar
  • 1
-1 votes
3 answers
3k views

What's the effect of Pressure change in Chemical Equilibrium if any reactant or product is Solid or Liquid?

I am studying La-Chatelier's Principle of Chemical Equilibrium. I got a problem of Pressure change in Chemical Equilibrium. I know that Pressure change If a reversible reaction is in equilibrium ...
Sindid's user avatar
  • 1
-2 votes
2 answers
3k views

Reaction between NaCl and NaHCO3 [closed]

Does NaHCO3 (aq) react with NaCl(aq)? I don't think they should undergo any reaction but in the online database it is showing that they react to form Na2CO3 and HCl. Is it correct?
Kuldeep's user avatar
-2 votes
1 answer
295 views

Sucrose skeletal formula - missing Carbon and Hydrogen [duplicate]

I was reading the Wikipedia article about Sucrose, when I noticed that the skeletal formula was missing some $\ce{C}$ and $\ce{H}$ atoms. The chemical formula being $\ce{C12H22O11}$, I counted the $11$...
Richard Neumann's user avatar
-2 votes
0 answers
37 views

what is the main difference between ionic and covalent bonding? [closed]

I'm trying to grasp the concepts of ionic and covalent bonding for my chemistry class. Can someone explain the key differences between these two types of bonds and how can you determine the type of ...
Ryan Smith's user avatar
-2 votes
1 answer
56 views

Hydrogen oxidation number

I am aware that since 2005, IUPAC guidelines established that hydrogen is more electronegative than all elements from group V in the periodic table (you can check official documentation). Thus, $\ce{...
SerMig1111's user avatar
-3 votes
1 answer
66 views

What does the dot indicate in the molecular formula for white lead? [duplicate]

I came across the following molecular formula for white lead: $2\mathrm{Pb}\mathrm{CO3}·\mathrm{Pb(OH)_2}$. What does the center dot indicate here? Is this a non-covalent interaction of some kind? ...
imrobert's user avatar
  • 163
-3 votes
1 answer
232 views

Lewis structures and chemical-compound formulas [closed]

In the Lewis structures listed below, M and X represent various elements in the third period of the periodic table. Write the formula of each compound using the chemical symbols of each element: a. b. ...
Win_odd Dhamnekar's user avatar
-3 votes
1 answer
67 views

I am having trouble with this question on net ionic equation [closed]

Convert into molecular equation: The reaction between potassium dichromate, ferrous sulphate and sulphuric acid:- Cr2O7^2- + 14H^+ + 6Fe^2+ ---> 6Fe^3+ + 2 Cr^3+...
Aditya_math's user avatar