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What is the molar mass of a gas that has density of 2.054 g/l

Hydrogen-2 is also known as deuterium as well as hydrogen-3 is known as tritium hydrogen-1 is our common hydrogen isotope a sample hydrogen gas has 99% hydrogen -1 ,0.8% deuterium , and 0.2% tritium what is the average atomic mass of this mixture of isotope to the thousands place

The chemical name for laughing gas is dinitrogen oxide. the two elements found in a sample of this gas are and