if a balloon filled with dry hydrogen weight 35 g but weight 440 g when filled with the vapour of an organic compound, calculate the: vapour density

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with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence

i think the answer is terrae but not 100 percent sure. ▓▬▬ §

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year