The element hydrogen has three naturally occuring isotopes. Name Symbol Mass (am

Question

The element hydrogen has three naturally occuring isotopes. Name Symbol Mass (amu or g/mol) Protium 1H 1.0078 Deuterium 2H or D 2.0141 Tritium 3.0160 H or T What are the molar masses of H20, D20, and T20? The average mass of O is 15.999 g/mol. HLO T,O D,O Number Number g/ mol g/ mol g mol On Earth, hydrogen is nearly all protium, with some deuterium and a negligible amount of tritium. Thus, H20 (which is made up of H20, D20, and T20) has a molar mass that is nearly identical to 1Hzo. What is the molar mass of water on a fictional planet where hydrogen is made up of 33.0% protium, 19.0% deuterium, and 48.0% tritium? Number g/mol

Explanation / Answer

> molar masses of 1H2O = (1.0078)2 + 15.999 = 18.0146 g/mol

> molar masses of D2O= (2.0141)2 + 15.999=20.0272 g/mol

> molar masses of T2O= (3.0160)2 + 15.999= 22.031 g/mol

b)

the atomic mass of hydrogen on a fictional planet where hydrogen is made up of 33.0% protium, 19.0% deuterium, and 48.0% tritium is = [ atomic mass of isotop(1) x % abundance + atomic mass of isotop(2) x % abundance + atomic mass of isotop(2) x % abundance ] / 100

av.atomic mass of hydrogen = [1.0078 x 33.0 + 2.0141 x 19.0 +  3.0160 x 48.0 ] / 100

= 2.163

molar mass of water = (2.163)x2 + 15.999=20.325 g/mol

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