the atomic weight of hydrogen is 1.008. find the percent of the H1^1 and H1^2 isotopes present in it.
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Answers
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Step-by-step explanation:
The number 1.008 is a relative mass, not the mass of hydrogen in grams or kilograms. Hydrogen has a average, relative mass of 1.008 amu/atom or 1.008 g/mol
Instead, to get the actual mass in grams....
1.008 amu x (1g / 6.022x10^23 amu) = 1.674x10^-24 grams
For some applications, the mass in kilograms is needed: 1.674x10^-27 kg.
========= Follow up ===========
There are two naturally occurring isotopes of hydrogen, H-1 and H-2. But there are vastly more H-1 atoms than H-2 atoms. The percent relative abundance of H-1 is 99.9885% and the atomic weight is 1.007825 amu, which rounds to 1.008 amu. At that precision we don't differentiate between the isotopic mass of H-1 and the relative mass of hydrogen.