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OpenStudy (anonymous):
how many moles are in 25mg of O2? (molar mass of O= 16g/mol) The answer is 7.8x10^4 but I don't know to do it
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OpenStudy (australopithecus):
moles = grams/molecular mass
OpenStudy (australopithecus):
use this formula
OpenStudy (australopithecus):
1000mg = 1g
OpenStudy (australopithecus):
25mg converted to grams is just 25mg(1g/1000mg) = 0.25g
OpenStudy (anonymous):
.025g/16 gives me 1.5625x10^-3 not 7.8x10^-4 @australopithecus
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OpenStudy (australopithecus):
You need the molecular mass of O2, you probably divided by just the molecular mass of a single oxygen atom, there are 2 oxygen atoms in O2
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