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What is the liquid which has the most hydrogen atoms per volume at STP ? Is there anything better than water?

This answer does not answer this question because none of the compounds listed in it are liquids at STP, which contain more hydrogen per volume than water.

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    $\begingroup$ Hydrazine is slightly better. $\endgroup$ – Ivan Neretin Aug 12 at 15:03
  • $\begingroup$ How about liquefied methane? $\endgroup$ – Shriom707 Aug 12 at 15:15
  • $\begingroup$ Methane is not a liquid at STP. Without this temperature and pressure restriction, the liquid Hydrogen would beat them all ;) $\endgroup$ – George Robinson Aug 12 at 15:21
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    $\begingroup$ No, that's wrong. Liquid methane contains more hydrogen per volume than liquid hydrogen itself. $\endgroup$ – Ivan Neretin Aug 12 at 17:11
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    $\begingroup$ Does this answer your question? Most dense hydrogen containing composition $\endgroup$ – Mathew Mahindaratne Aug 13 at 7:05
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Hydrazine has more hydrogen atoms per mL than water

Some simple calculations give the moles of hydrogen per mL in some possible alternative liquids. Taking into account density and molecular mass we get the following results:

Water 0.056 mol/mL 2 Hydrogens -> 0.11 mol H/mL Hydrazine 0.0313 mol/mL 4 hydrogens -> 0.125 mol H/mL

symmetric dimethylhydrazine 0.0138 mol/mL 8 hydrogens -> 0.111 mol H/mL methyl hydrazine 0.0191 mol/mL 6 hydrogens -> 0.115 mol H/mL

So, while some other liquid at STP hydrazine derivatives beat water, it looks like hydrazine has notably more hydrogens per unit volume. This is probably the record.

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Some solid metal hydrides have more hydrogen per unit volume than either liquid or solid hydrogen. They are candidates for storage in hydrogen-fueled processes. A few examples of such metal hydrides are given here.

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  • $\begingroup$ Are they liquid at STP ? $\endgroup$ – George Robinson Aug 13 at 21:03
  • $\begingroup$ Did I not qualify the answer by identifying these materials as solid? $\endgroup$ – Oscar Lanzi Aug 13 at 21:04
  • $\begingroup$ Did I not qualify the question by asking for identification of materials that are liquid at STP ? Your answer refers to solid materials, thus it is off-topic. $\endgroup$ – George Robinson Aug 14 at 10:02

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