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3 votes
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Why is the Molar mass of CO2 different than the weight of the sum of its particles?

This is a really interesting question actually! I'm new to answering questions on this site but I'll explain as best I can. As others have said, the difference in this particular calculation comes ...
cp95's user avatar
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10 votes

What do bracketed plus-sign-notations such as (+M) or (+O2) next to reaction participants mean?

I think the OP is exploring this paper from 1975, behind paywall. Since the paper is about half a century old, there are some non-standard notations. However the context is clear from Karsten's answer ...
ACR's user avatar
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6 votes
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What do bracketed plus-sign-notations such as (+M) or (+O2) next to reaction participants mean?

In gas phase reactions, it is not uncommon to have a non-reacting molecule provide or take up kinetic energy as part of the reaction. For example, $$\ce{O2(g) + O(g) + M(g) -> O3(g) + M(g)}$$ ...
Karsten's user avatar
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0 votes

Why does polonium form acidic oxides?

Strictly speaking, "polonium oxide" is not necessarily acidic. There are three known polonium oxides, but only the most stable one, $\ce{PoO2}$, is well charactetized. Wikipedia reports that ...
Oscar Lanzi's user avatar
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1 vote

Effective nuclear charge increases along period despite increasing number of electrons

As you go across the periodic table, you'll experience two things: An additional proton An additional electron While the number of electrons increases, these electrons are added to the same ...
Melanie Shebel's user avatar
2 votes

White powder-like substance on top of sodium hydroxide solution

Citing the entry in Perrin about solid anhydrous sodium hydroxide, p. 349: Common impurities are water and sodium carbonate. Sodium hydroxide can be purified by dissolving 100g in 1L of pure EtOH, ...
Buttonwood's user avatar
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5 votes

White powder-like substance on top of sodium hydroxide solution

It should be sodium carbonate. Sodium hydroxide, solid or dissolved, is the trap for aerial carbon dioxide. $$\ce{2 NaOH(s,l) + CO2(g) -> Na2CO3(s,aq) + H2O(l)}$$ The carbonate presence in ...
Poutnik's user avatar
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5 votes
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Converting cif file with powdll, plotting cif file in excel

If you want to plot a theoretical powder diffractogram (PXRD), i.e. diffraction intensity (arbitrary units along the ordinate) in function of diffraction angle $2\theta$ (in degrees along the abscissa)...
Buttonwood's user avatar
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1 vote

Covalency in bonding across the periodic table

Thinking about the requirement: ...if you have a polarizing cation and a polarizable anion like in AgCl for example, you get covalency. must lead one to conclude, in the example, $\ce{Rb9O2}$ , ...
Paul Kolk's user avatar
3 votes

Are homoatomic molecules like ozone, graphite, diamond considered as elements

The definitions you provide were good enough for 18-19th centuries. Unfortunately, many school books in different parts of world have not changed. The modern understanding of an element is that its ...
ACR's user avatar
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7 votes
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What is less coordinating to metals? Triflates or hexafluorophosphates, and why?

Your statement, "I read that triflates and hexafluorophosphates are both non-coordinating," may not exactly correct. Actually, the triflate $(\ce{CF3SO3-})$ is weakly coordinating (Ref.1) ...
Mathew Mahindaratne's user avatar
2 votes
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Mechanism of Zn + NaOH?

To develop Mithoron's information, it can be said that the reaction of zinc with $\ce{NaOH}$ does not produce the logical and expected sodium zincate $\ce{Na2ZnO2}$ as believed without proof in the ...
Maurice's user avatar
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0 votes

Can a ferrite magnet be impregnated with polymer to reduce its fragility?

I would suggest soft metals mixed with the ferrite. Nickel, Cobalt, Iron, Nickel-Iron alloy. Study well the phase diagram and consider equipment and process to control and leverage the boundaries to ...
sam dan's user avatar
  • 11
1 vote

The order of increasing covalent nature in group 12 (Zn, Cd and Hg)

It may seem strange to talk of a relativistic inert-pair effect for an element in such an early period as cadmium's, but here we are. The inert-pair effect favors covalent rather than ionic bonding ...
Oscar Lanzi's user avatar
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4 votes
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Hydrogen in Organometallic Chemistry

All these structures meet the 18-electron rule, but in different ways. Structures 23 and 24 may each be represented as a superposition of two 18-electron structures, shown below for 23 in which each ...
Oscar Lanzi's user avatar
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