acetic acid 0.921% (w/w) 100grams. The acetic acid will be measured by weight. how much is used?

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acetic acid 0.921% (w/w) 100grams. The acetic acid will be measured by weight. how much is used?

Mathematics
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What does (w/w) mean?
weight in weight
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Other answers:

@aaronq come in here. So im guessing it means : \[\sf \frac{0.921 ~g~C_2H_3O_2}{100~g~comp}\]
i sent the actual question above. with 4 answers..
acetic acid 0.921% (w/w) 100 grams. means that there is 0.00921*100 g =0.921 g of acetic acid and 100 g - 0.921 g = 99.079 g of solvent
oh i see how it works now
from that picture posted, it's A and C, because of the units
okay, coooool
so its a and c? why?
because of the units, 0.921 g = 921 mg
ok. thank you so much.. both of you ..
Are you willing to help me understand other questions?
no problem guyses, idk if you're asking me, but if so, you should post in the chem section
im asking either of of you
if not, would you really consider this chem?
yeah
its actually pharmacy compounding math
pharmacy is based from chem and bio
are you willing to help me understand a few other questions ?
yep
ok thank you i will post the next question
kk
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if possible explanations please.
I am trying to get some of these done before work tomorrow
along with understanding them
so, v/v means volume by volume, it's pretty straight forward that in 100 mL of 50 % v/v glycerin solution there is 50 mL of glycerin.
what about the second question
i should have just read that one. that was common sense but im old..
is the answer to 17. 6.25ml?
sorry, i had to step away from the keyboard. yes, that's the answer. you basically just have to watch the units
its ok . i am trying to do this, which most has nothing to do with what i do at work. and thank you so so much
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here is another one if you can help thank you
which one?
i need to do all 3 questions? so what ever you can help with
well one is d
so 2 and 3
b) is 400 mg 0.02*20 g =0.4 g = 400 mg
wow thank you.. at least i can see it now
for c) you add the whole masses and make a dilution \(2\%*20g=x\%*(20~g+30~g+30~g)\rightarrow x\%=0.5\%\)
lol sorry that sounds to weird, i meant "add all the masses" not "the whole.." lol
add all the grams
yep
grams is a unit of mass
you are a great help.. can you help with a few more? i dont want to over welcome my help
I would but i have to go do laundry and stuff. Hopefully someone else can come help ya, if you can't find help here, try the chem section.
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ok thank you so much

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