Posted by Sara on Wednesday, August 22, 2007 at 5:30pm.
D=M/V
Just my calculations..
empty flask + stopper= 37.34g
flask + stopper + water= 63.67g
water= 63.67g - 37.34g= 26.33g
D of water = 0.9970g/cm^3
V of water = M/D
V water= 26.40cm^3
flask + stopper + liquid = 52.01g
liquid= 52.01g- 37.34g= 14.67g
V same as water so...26.40cm^3
then to get D for unknown liquid
D=M/V
D= 14.67g/26.40cm^3 = 0.5556g/cm^3
Unknown Metal D
(have to find the volume)
stoppered flask + metal = 61.28g
stoppered flask empty (from before)= 37.34g
metal mass = 61.28g- 37.34g = 23.94g
Stoppered flask + water= 78.19g
water mass = (78.19g + 23.94g)-37.34g= 67.79g
Vol of water = Mass/Density
67.79g/(0.9970g/cm^3)= 67.99cm^3
Orig Vol- new Vol= 67.99cm^3-26.40cm^3= 41.59 cm^3 (vol of metal)
D of metal= Mass/Vol
23.94g/41.59cm^3= _________g/cm^3?
Hint: it's not the same =D
The correction for this(If anybody cares to look anymore) (I feel I have a responsibility to correct the error
=()
So...
_______________________________________
water mass = 78.19g - 23.94g-37.34g=
16.91g
Vol of water = Mass/Density
16.91g/(0.9970g/cm^3)= 16.96cm^3
Orig Vol- new Vol= 26.40cm^3 -16.96cm^3= 9.44cm^3 (vol of metal)
D of metal= Mass/Vol
23.94g/9.44cm^3= 2.54g/cm^3?
I checked twice this time so it SHOULD be correct.
mass = volume x density
volume = mass/density
volume of flask = 26.33/0.9970 = 26.41 cc or therebouts, not 37.45.
I didn't go through the remainder except that the mass of liquid is correct at 14.67.
Repost if this doesn't clear it up for you.
water mass = (78.19g + 23.94g)-37.34g= 67.79g
Vol of water = Mass/Density
67.79g/(0.9970g/cm^3)= 67.99cm^3
I'm not sure I buy this part.
mass flask + metal + H2O = 78.19
mass flask + metal = 61.28
mass H2O = 78.19-61.28=16.91 g OR
flask + metal + H2O = 78.19
metal = 23.94
flask = 37.34
H2O = 78.19-23.94-37.34 = 16.91 g.
I think the mistake is ADDING the 23.94.
Check my thinking.
Ya, I noticed that too...I reposted what I did clearer, so please look at that version. I wrote down everything I did and were my problem is.
Thanks for the help!
Yes Now looking at that again...
it should be subtraction.
Thanks for catching that Dr.Bob =D
(I should check twice next time)