Please if you answer... break it down so I can come to understand how to find density of a substance. This is NOT (NO LONGER) homework... but it will be covered on an extensive exam.
2007-07-21 14:43:01 · 5 answers · asked by adkins147 1 in Science & Mathematics ➔ Chemistry
Ok, We covered that d=m/v... and the way I understood it was our answer was to end up as g/cm... I am just confused how to get to that point... as cm is a unit of length... not volume.
He provided the example:
mass: 50g
volume: 100cm
D = 50g/100cm = 0.5g/cm^3
2007-07-21 15:04:10 · update #1
if you are being tested on desnity you MUST have learned it is mass divided by volume. D = m/v
2007-07-21 14:46:27 · answer #1 · answered by JosephG 1 · 0⤊ 0⤋
You need to let us know if there is more to the problem. Without that, the simple answer is 8.05 lbs/gallon (mass/volume).
You can convert lbs to other mass units such as kg or grams and convert the gallons to units like L. Whatever units you convert to, the just do mass/volume and you have the answer in those units.
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The unit is cm^3 (cubic centimeters). Any length unit cubed is a volume.
1 cm^3 = 1 mL (milliliter), so convert the lbs to grams and the gallons to mL and thus to cm^3 which will be the same.
You could also use online conversions to check your work when you get an answer or to see the conversion factors.
2007-07-21 14:52:43 · answer #2 · answered by Peter Boiter Woods 7 · 0⤊ 1⤋
The cm is wrong...it should be ccm or cc, both meaning cubic centimeter (cm^3) a unit of volume.
8.05 lbs x 453.6 (grams/lb) = 3651.5 grams
1 gallon x 3.7853 liters/gallon = 3.7853 L or 3,785.3 cm^3
3651.5/3785.3=0.965 gm / cm^3
2007-07-21 16:32:21 · answer #3 · answered by skipper 7 · 0⤊ 0⤋
Its actually quite simple.
Water has a density in English units of 8.34 lbs. /gallon
In metric units it is 1 g / cm3
If your milk is 8.05 lbs. / gal, just divide it by 8.34 and you are done!
2007-07-21 16:01:39 · answer #4 · answered by reb1240 7 · 1⤊ 0⤋
Density is Mass ÷ Volume and is measured in Lbs/gal, grams/Litre, kg/m³.
Therefore your 8.05lbs/gal for milk is already its density.
But, 1 US gallon of water = 8.3lbs.
However if you're looking for the density in metric then:-
The 'Specific Gravity' (S.G.) of the milk:...
= The Density of Milk ÷ The Density of the same volume of Water..
= 8.05lb/gal ÷ 8.3lb/gal (US), so the S.G. = 0.970.
In Metric...Density is generally recorded in grams per litre g/L or kilograms per cubic metre (kg/m³)
The density of water = 1,000g/L and, as we now know the S.G. of the milk, and we multiply 1,000g/L by the S.G. we get
1,000g/l x 0.970 = 970g/L = Density of milk.
or, 970g/L x 1,000 = 970kg/m³.
2007-07-21 17:24:34 · answer #5 · answered by Norrie 7 · 0⤊ 0⤋