Why is the numerical value of a mole of atoms equal to the atomic weight? For example, hydrogen has an atomic weight of 1.008, so 1 mole of hydrogen atoms has a molar mass of 1.008 g/mol. Why?
closed as unclear what you're asking by Jan, bon, andselisk♦, Todd Minehardt, Tyberius Oct 25 '17 at 17:39
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If i assumed your question right here is the answer.
1 mole=6.022*10^23 particles (its not any unit of mass)
atomic mass of atoms are often expressed in a unit called amu.
1 amu=1.6605*10^(-24) gram (more significant figures are there)
according to your question
mass of 1 hydrogen atom is 1.008 amu
= 1.008*1.6605*10^(-24) = 1.6737*10^(-24) gram
for 1 mole particles
mass =1.6737*10^(-24) * 6.022*10^(23) = 1.0079 g/mol (approximately 1.008)