2015年1月7日 · The problem was that physics stuck to isotopically pure O-16 for their mass scale, and chemistry used "oxygen" (i.e., with some O-17 and O-18 present). There's 0.028% …

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2017年6月21日 · The equation below represents combustion of methane ($\ce{CH4}$, $\pu{16.04 g/mol}$). Balance the equation, and calculate the mass of water ($\pu{18.02 g/mol}$) formed …

2017年5月4日 · Examples include $\ce{^{12}C}$, $\ce{^{16}O}$ and $\ce{^{32}S}$. All other nuclei are NMR active: Odd/Odd. Nuclei that contain an odd number of protons and an odd …

2018年7月8日 · The graph of binding energy per nucleon (Hyperphysics) seems to peak at Iron-56. However, Wikipedia says that Nickel-62 has the highest binding energy per nucleon of any …

2022年8月30日 · So the covalent binding energy expected for the proposed $\ce{O#O}$ triple bond in the gas phase would be insufficient to overcome the repulsion between two positive …

2020年7月6日 · Chemists choose to define the amu as 1/16 of the average mass of an oxygen atom as found in nature; that is, the average of the masses of the known isotopes, weighted …

2021年4月21日 · The simplest and most direct explanation is that isotopically heavier molecules have higher boiling points. Regular water (R) boils at 100.0 $^o$ C. Heavy water (H) boils at …

2014年6月20日 · $\begingroup$ @Martin that is a good point, but I think that for the most part 'amu' is understood to be the unified atomic mass unit based on carbon-12, not oxygen-16. I at …

2018年2月20日 · For water, the temperature of the triple point (273.16 K) is remarkably close to its freezing point at atmospheric pressure (273.15 K). Because 0 °C was originally defined as …