slow loris Posted December 15, 2016 Share Posted December 15, 2016 Hello! I have this question in my textbook, in which I know the answer, yet I cannot figure out how to obtain it: The air has helium 0,0007% (m/m). Convert this concentration into ppm. The answer should be 0,7ppm. Thank you for reading this! Link to comment Share on other sites More sharing options...
_Rick_ Posted December 15, 2016 Share Posted December 15, 2016 Parts per million 0.00007% means 0.00007 per 100 (percent) Thusly 0.00007/100 = 0.0000007 0.0000007 * 1000000 = 0.7 Parts per million 1 Link to comment Share on other sites More sharing options...
slow loris Posted December 15, 2016 Author Share Posted December 15, 2016 Thank you so much! I haven't thought of that kind of method. That will help me with a whole bunch of upcoming stuff, I really appreciate it. Link to comment Share on other sites More sharing options...
hypervalent_iodine Posted December 15, 2016 Share Posted December 15, 2016 I don't think the answer given is correct. Ppm is parts per million. From a percentage concentration, calculating ppm is just a matter of multiplying by 10000 (since % is parts per hundred). Given that, and assuming you've provided the correct number as per the question, I get 7ppm. Can you check that the question states 0.0007% and not 0.00007%? Parts per million 0.00007% means 0.00007 per 100 (percent) Thusly 0.00007/100 = 0.0000007 0.0000007 * 1000000 = 0.7 Parts per million This is correct, but the OP doesn't give 0.00007% as the value. Link to comment Share on other sites More sharing options...
slow loris Posted December 15, 2016 Author Share Posted December 15, 2016 The question states 0,00007%, and the answer says 0,7ppm. Sorry I did a typo earlier and typed 0,0007 instead of 0,00007. Thanks for your help so much though! Link to comment Share on other sites More sharing options...
FrankP Posted December 21, 2016 Share Posted December 21, 2016 Parts per million 0.00007% means 0.00007 per 100 (percent) Thusly 0.00007/100 = 0.0000007 0.0000007 * 1000000 = 0.7 Parts per million This was prob the easiest way anyone could have explained this nice job. I have favorited this for future use by myself as well. I know I will end up needing this down the road. Link to comment Share on other sites More sharing options...
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