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Questions tagged [density]

For questions involving (theoretical or experimental) comparison of density of elements or substances, calculating density of solutions, effects of temperature on density, and other chemical aspects of density.

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15 views

How to make equal density pool dye without diffusion

I have a leak I have been struggling to find in my in-ground pool. I am losing about 1/4" of water per day and I believe the issue is one of the fittings in the bottom of the pool. There are two ...
0
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0answers
5 views

gemcitabine specific gravity or density [closed]

Can anybody tell me what is the density of gemcitabine (or its specific gravity) when dissolved in normal saline (Sodium chloride 9%) according to manufacturer's instructions?
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1answer
53 views

Density of D-block elements

Something that confuses me slightly is the trends in density when comparing periods 4, 5, and 6 in the d-block. Looking at periods 5 and 6, the density peaks at group 8, with Ruthenium and Osmium ...
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0answers
31 views

What is DNA Concentration?

Watching The "Making a Murderer" documentary an analytical chemist claimed they found .14 nano grams per microliter on a car key. What exactly do they mean by stating it this way? Why wouldn't they ...
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0answers
10 views

Measuring alcohol content using a Gay Lussac aclohol meter

I am trying to determine the alcohol content of a home brewed beverage; I only have a Gay-Lussac alcohol meter at my disposal. From my understanding, the Gay-Lussac degree will be accurate only at the ...
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1answer
54 views

How to determine the volume of water necessary to produce a solution with 4.9 g/l sulfuric acid?

The molar mass of sulfuric acid is $M(\ce{H2SO4}) = \pu{98.1 g/mol}$. We have $\pu{100 mL}$ of a $0.1$ molar solution of sulfuric acid. What volume $V$ in $\mathrm{mL}$ of water, $\ce{H2O}$, do we ...
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0answers
72 views

What is the actual density of CAS 7647-14-5 (NaCl, 99+%)?

I'm not a chemist by profession, so please forgive any syntactical or vernacular oversights on my part. Basically, I'm getting mixed messages from different sites about the density of sodium chloride....
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0answers
24 views

Does the solubility of a salt effect the volume of the resulting solution?

Lets say I have an ionic salt with a density of 1.3 g/mL that has a solubility of say, 10g/mL. If I drop 1.3 grams of this salt into 1 mL of water and shake it until completely dissolved will the ...
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0answers
27 views

Is H2O the only compound with a density anomaly? [duplicate]

My question is simple: are there any elements, compounds or materials other than water (H2O) which have a density anomaly characterized by a turning point in the τ-ρ curve?
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0answers
37 views

Equation of state (EoS) for liquid density, in terms of pressure, temperature and concentration

I'm currently in need of an equation to calculate density of aqueous solutions such as acids, bases, and salts. The equations to calculate liquid density that I have found so far do not account for ...
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0answers
54 views

Find alloy composition by density

I have a square piece of metal from a processor heat sink that looks a lot like copper. I'm trying to find the alloy composition but I'm not sure how. I happen to have both a digital caliper and a ...
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1answer
39 views

Is there a formula for density of any gaseous substance just based on its molar mass?

$\pu{112 ml}$ of hydrogen combines with $\pu{56 mL}$ of oxygen to form water. When $\pu{224 mL}$ of hydrogen is passed over heated cupric oxide, the cupric oxide loses $\pu{0.160 g}$ of its weight. ...
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0answers
33 views

What chemical compound contains the highest amount of hydrogen for a given volume?

For example liquid methane has a density of 0.422 g/cm^3 and is 1/4th hydrogen by mass, so it has more hydrogen per unit of volume than plain old liquid hydrogen at 0.07g/cm^3. Long-chain hydrocarbons ...
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0answers
89 views

Electron Probability Density Functions

I am a mathematics and chemistry double major and I just finished my statistics requirement and a great deal of the class was spent on probability distributions (e.g. Binomial, Poisson, Geometric, ...
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0answers
51 views

What's the density of a frozen ethanol or ethanol solutions?

How can we know what's the density of ice (water), but there's no data on how much is the density of frozen ethanol? (as far as I know)
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0answers
42 views

Fluorocarbon wrong density specifications

I found this data table and in density row, the information seems wrong to me. The problem is that some of these fluorocarbons are in gas form while others are in liquid form at the temperature that ...
3
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1answer
591 views

How can I interpolate between two densities at different temperatures?

I'm trying to find the temperature of methanol ($\ce{CH3OH}$) when its density is equal to $\pu{780 kg m-3}$. I know that when $T = \pu{30^\circ C}$ the density is equal to $\pu{783 kg m-3}$, and ...
1
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1answer
49 views

What is the mathematical relation for the change in water density at different temperatures?

I am curious to the relation of the density of water at different temperature and as to also how one would come to an equation that took the temperature of the water and would output it's density? I ...
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2answers
40 views

Which easy-to-acquire clear liquid would be best for testing whether or not a twenty-sided die is balanced?

In another question on another stack, I asked if the Saltwater float present in a specific youtube video was capable of determining any differences in mass between the faces of a die in determining ...
5
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3answers
469 views

Calculating the density of a saturated salt solution

Is there a way to calculate the density of a saturated salt solution from the solubility limits or does it have to be experimentally determined? First instinct, is to add the mass of the salt to ...
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1answer
34 views

Concentration of electrons in silicon sample with a phosphorus dopant

I'm studying electrical and computer engineering and all I remember from chemistry is from high school. We have a $\ce{Si}$ sample and we want to replace one in every million atoms with a phosphorus ...
-2
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1answer
270 views

Calculating mass from just density? [closed]

So I just started chem 101 and I'm not sure how to solve this problem. This is a problem from the dimensional analysis section of our book. It seems like the question wants me to get mass purely from ...
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1answer
150 views

Isotopic mass to density

I want to figure out/calculate the density ($\pu{g/cm3}$) of the various isotopes, here $\ce{^109Ag}$. I know it's isotopic mass is $\approx109$ and calculated the number of particles/gram. But I ...
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2answers
334 views

Converting mass percentage of a solution into its density? [closed]

Is there a way of converting mass percentage of a solution to obtain its density? (With mass percentage been given and the compounds which are mixed to form the binary solution)
9
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0answers
193 views

What are these “certain chemical compounds” denser than osmium?

The Wikipedia entry for density states Osmium and iridium are the densest known elements at standard conditions for temperature and pressure but certain chemical compounds may be denser. I ...
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1answer
259 views

Why are group 1 elements so low in density?

I was studying the s-block elements and found that they extremely low in density. Lithium is said to be the least dense solid in the entire periodic table and their Cohesive Energies are also very low....
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6answers
3k views

Why is the specific gravity of 0.9 % saline 1.0046?

Medical Normal Saline (0.9% Saline) contains 9 g of salt dissolved in 1000ml of water. Hence a litre of NS should weigh 1.009 kg. Hence its specific gravity should be 1.009, but it’s only 1.0046. (I'...
0
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0answers
20 views

Are the Temperature-Density Characteristics of all Hydrogen Bonded Molecules the Same as Water's [duplicate]

I know that liquid water has a higher density than ice because it forms a lattice as a solid which takes up a greater volume than would be taken up by the same mass of liquid water. However, does the ...
8
votes
1answer
2k views

Calculating the theoretical Density of a Lithium oxide

I am trying to calculate the theoretical density for lithium oxide using the following formula $$\rho= \frac{n^{'}\sum M_c+\sum M_A}{V_c N_{AV}}$$ where $n^{'}$ is the number of formula units in unit ...
3
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1answer
322 views

Why is methyl iodide more dense than ethyl iodide, even though the latter has more carbon atoms?

It is understood that more carbon atoms present in a hydrocarbon, the greater the density of the hydrocarbon. But then why does $\mathrm{CH_{3}I}$ have a greater density than $\mathrm{C_{2}H_{5}I}$?
2
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1answer
98 views

The definition of density

Could density be defined as the measure of matter per unit volume instead of mass per unit volume because mass is a measurement of matter?
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0answers
94 views

Why does increasing electronegativity difference result in decreasing density?

I've been collecting data and there's a very strong inverse relationship between electronegativity difference and density ($\pu{R^2}$ value of roughly 0.95 from my data). Is there any chemistry that ...
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3answers
5k views

Why do helium balloons expand in volume as they go higher?

I realize as balloons go higher, the atmospheric pressure decreases, doing less to counteract the force of the gas particles pushing against the inner walls of the balloon. But at the same time, doesn'...
2
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1answer
937 views

Maximum density of heavy water at 11.6 degree Celsius?

I came across a question asking me the temperature at which $\ce{D2O}$ will have maximum density. I didn't really know, so I checked the answer, and I found that the answer is $\pu{11.6^oC}$. But why ?...
3
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2answers
560 views

Density of moist air

Why does moist air have lesser density than dry air? When the amount of vapor inside increases, the mass increases and hence won't the density as well increase?
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1answer
629 views

Separation of Liquids based on Density

I was doing some practice problems when I came across this one The answer key says the answer is B but I don't know why. Isn't the difference in the molar masses of the two substances in D greater ...
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3answers
8k views

How does density of alkali metals increase down the group?

Size of alkali metals increases down the group, so volume also shows increment, and since volume is inversely proportional to density, how does density also increase down the group?
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1answer
578 views

How to formally calculate the surface density of layered materials such as graphene?

Typically density is defined in units of mass per volume. In the case of graphene it is mass per area, i.e. surface density. What would be the correct way to calculate the surface density (mass per ...
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0answers
272 views

Correction formula for alcoholmeter

I need to find the formula, if there is one, which would calculate the correction of alcoholmeter. Basically convert observed %ABV (Alcohol by volume) to actual %ABV using the sample's temperature. ...
1
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1answer
217 views

What is pure oxygen (gas) density as a function of T or P?

I'm looking for a set of data (ideally graphed) of $\ce{O2}$ density as a function of $T$ or $p$ (with constant $p$ or $T$, respectively). The best I've found is this 1948 paper which provides an ...
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4answers
2k views

Can you theoretically hold more of a volume of water the colder it is?

I have basic knowledge of chemistry and how it all works (will be taking the class next year) but I understand density and mass. Since the hotter a liquid, in this case, the molecules are more ...
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1answer
88 views

Why doesn't the density of water add up? [closed]

If the density of hydrogen is 0.09 g/ml and the density of oxygen is 1.429 g/ml, how is it that the density of water is 1 g/ml?
3
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1answer
65 views

Density of cyclic hydrocarbons

Why is the density of cyclic hydrocarbons more than that of their acyclic counterparts? For ex: ...
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0answers
94 views

How is density “predicted”?

Hassium is predicted to be the densest element at 41 g/cm ^3, but how do you predict something like that? Wikipedia says there have only been 100 hassium atoms made to date and it's half life is less ...
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1answer
184 views

How would one make a non-toxic pen out of osmium?

Osmium is the densest element in the periodic table. However, it is toxic in its pure form. Is there a way to create a standard pen out of osmium but coat it in a dense material that isn't toxic to ...
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1answer
252 views

How to find the volume of ice given its density, and the volume and density of water used? [closed]

Just trying to understand density calculations, for example, Water has a density of $\pu{0.997 g cm^-3}$ at $\pu{25 ^\circ C}$; ice has a density of $\pu{0.917 g cm^-3}$ at $\pu{-10 ^\circ C}$. If a ...
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3answers
161 views

Gas densities and the atmosphere

The density of nitrogen is greater than the density of oxygen, hence the denser nitrogen would be present in the lower atmosphere. If so it would be deprived of oxygen as it would be pushed to the ...
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0answers
34 views

What's causing my energy calculations to be wrong?

I'm calculating the energy density of certain flammable compounds in MJ/kg. To do this I compare the sum of the bond strengths of the reactants to the products and then extrapolate the energy density ...
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2answers
2k views

Liquid floating on top of water due to density or insolubility?

When a liquid is floating on top of water, how can one tell whether it is because of its insolubility in water or because it has lower density than water?
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1answer
688 views

Water and olive oil intereactions

This is really basic knowledge, but I am a little confused. I understand that if you put a tablespoon of water and a tablespoon of olive oil in the same container the water descends at the bottom of ...