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I have seen periodic tables of Mendeleev (1834-1907) and Newland (1837-1898) in which masses of gases such as oxygen and nitrogen were shown. I don't think there were instruments to measure mass of gases at that time. So how were they able to predict the mass of gases at that time accurately?

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    $\begingroup$ Hm? Of course the molar mass of gases was known at the beginning of the 19th century. Heard of Avogadro? One liter of air weighs over one gram, that's not exactly difficult to measure. $\endgroup$ – Karl Jul 1 '18 at 10:56
  • $\begingroup$ but how were they able to know the molar mass of gases at that time? And your statement "One liter of air weighs over one gram" is only telling mass of one liter of air and I can't relate that to mass of gases. $\endgroup$ – pranjal verma Jul 6 '18 at 12:04

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