# 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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### 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. ...
316 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 ...
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 ...
111 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?
81 views

### Density of cyclic hydrocarbons

Why is the density of cyclic hydrocarbons more than that of their acyclic counterparts? For ex: ...
161 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 ...
273 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 ...
640 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 ...
358 views

### Gas densities and the atmosphere [duplicate]

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 ...
35 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 ...
3k 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?
1k 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 ...
58 views

### A little help understanding some basic algebra(I think) in conversion pathways

Attached is a picture from my textbook. Here is my question: Must the 3.18cm(1.25in X 2.54cm) have to be cubed(^3) in order to cancel the cm in the 1cm^3 that is beneath the 22.59g Osmium? Is that ...
1k views

### What would happen if I mixed a single water molecule in a beaker of hexane?

What would happen if I mixed a single water molecule in a beaker of hexane? Would it sink or float? How about 2 water molecules? 3? Etc? In other words, how many water molecules does it take to be ...
119 views

### For covalent compounds, what is the microscopic difference between a solid and a liquid? [closed]

I've got a question regarding the microscopic difference between liquids and solids. I know that there exists a precise phase transition between solids and liquids, so some discrete parameter must ...
599 views

### Measuring volume change from change in mass

I want to measure the expansion (by change in volume) of a material in liquid. However the shapes are so complex that I can only measure their mass. Is it possible to compute the volume of the ...
104 views

### What causes mercury to expand equaly unregarded what the temperature increase is?

Mercury seemed to be a good liquid to use in thermometers. But why are most liquids expanding non-linearly with increase of temperature compared to other liquids?
7k views

### How to find Mass fraction by given mass and density

I'm given the following details: $m$(salt) = 100g; $V$($\ce{H2O}$) = 500ml; $D$($\ce{H2O}$) = 1g/ml; The question is what is the mass fraction of salt in a mix of $\ce{H2O}$ and salt? In order to ...
371 views

### Density of the methane [closed]

I would like to know the density of the Methane with a temperature of 348.15 Kelvin because i guess it is not the same that we can find on Wikipedia. Someone know where can i find that ? Thank you
48k views

### How to convert from w/w% to molarity?

After reading a number of explanations about it after googling, I'm a bit confused on this. Some explanations are doing it using a solution density, others aren't, though most are. On one site it's ...
2k views

### Does a freezing point of a substance always increase as its boiling point increases?

I am studying for an introductory to physical sciences test and came upon a chart describing substances found in petroleum and the distillation process. Each freezing point increases as each boiling ...
197 views

### Density of LPG in g/L [closed]

What is the density of LPG (in vapour state) in g/L? Please note that I'm asking about the density of vapour LPG when it comes out of the cylinder. NOT the liquefied density!
346 views

### Multiphasic liquid “flotation” experiment

I'm trying to create an experiment where two immiscible liquids are mixed and are then separated by density. Most of the container is occupied by the lighter liquid, and the small amount of heavier ...
3k views

### Mass of salt required to make a 1.2 g/ml solution

I would like to make an NaCl and water solution with a density of 1.2 g/ml. How would you calculate the grams of NaCl required to make a 1000 ml solution? I have used density of mixture = (mass NaCl +...
7k views

### Density and solubility

Do all saturated solutions have the same density? Based on your data, which salt is more soluble? \begin{align} &\ce{NaCl} & \pu{11.812 g/10 mL} \quad &\text{or} \quad \pu{1.181 g/...
Convert 100 grams of a solution to milliliters with a density of $681.9\rm~\frac{kg}{m3}$. It also has a density of 5.69 pounds per gallon. Are any or all of these correct? $$\rm100~g \times \frac{... 2answers 555 views ### Density of saturated KBr Google search shows the density of saturated \ce{KBr} is \mathrm{3.119\ g/ml} at \mathrm{25\ ^\circ C}. We have a solution of saturated \ce{KBr} and density is about \mathrm{1.5\ g/ml} when ... 1answer 5k views ### What is the boiling point and density of LSD? I have tried to do a lot of research and didn't succeed to find the boiling point and density of LSD. I would want to know this information. In addition, I can't use Clausius–Clapeyron equation ... 1answer 5k views ### Are there any gases more dense than liquids? Inspired by Is there any type of liquid, other than mercury, that PTFE teflon is known to "float" to the surface in?, are there gases that are more dense than liquids? (So bubbles would sink ... 1answer 396 views ### Is there any type of liquid, other than mercury, that PTFE teflon is known to “float” to the surface in? The specific gravity of PTFE teflon is roughly 2.3. I have a 3/8" diameter sphere made up of entirely PTFE teflon, and I would like for it to float to the surface when dropped into a liquid. Does ... 1answer 424 views ### determine density of oxygen gas using modified ideal gas equation I am trying to determine the density of a gas (oxygen). As the gas is a compressible fluid a modified version of the ideal gas equation is required. I have been given the following equation and I am ... 1answer 83 views ### Why are chemistry droppers bad at holding bromine? [closed] Question in my chemistry test last week. The question was related to a previous question on bromine's density. 2answers 1k views ### Most energy-dense commercial battery available What's the most energy-dense and currently commercially available chemical battery technology? Would it be the Lithium-Ion Polymer or has it been surpassed already? There's is a chemical non-... 2answers 142 views ### Density of plutonium oxide I am trying to find the mass density \rho of plutonium dioxide, \ce{PuO2}. I could calculate it, but the mass density of oxygen found in the literature is the density of gas oxygen. So I was ... 4answers 1k views ### Causing a metal or glass marble to float in an aqueous solution I am trying to find a way that you could cause metal (Aluminum) or glass to float in a mixture of water and some water-soluble material. I am aware that salt can be used to heighten the density of ... 1answer 986 views ### How high in (mmH2O) is the column of water in the tube? A long glass tube, sealed at one end, has an inner diameter of 23.4 mm. The tube is filled with water and inverted into a pail of water. If the atmospheric pressure is 735 mmHg, how high (in mmH2O) is ... 1answer 53 views ### Is there air in the volume of crystallized sodium hydroxide? I have a container of crystallized NaOH (98%) which has a volume of 500ml. Now, as per wikipedia, Sodium Hydroxide's density is 2.13g/cm3. This should give the weight of a 500ml container of NaOH at ... 1answer 88 views ### Medicine and chemical density related [closed] How are medicine densities calculated?For example what is the density of ascorbic acid 0f 250mg a pill? 1answer 197 views ### Using gas laws to find density An unknown gas at \mathrm{63.1\ ^\circ C} and \mathrm{1.05\ atm} has a molar mass of \mathrm{16.04\ g/mol}. What is the density of the gas? I know I need to use the pV=nRT equation but it ... 1answer 2k views ### Effect of incorrect volume reading on calculated density value When measuring the density using the displacement method, a student read the initial volume of the water too high, but the final volume reading was correct. This error would cause the calculated ... 2answers 118 views ### Density of wooden materials Would all wooden materials have the same density? Why or why not? (Examples may help). I have the following solution to the question: No, not all wooden materials would have the same density. Due to ... 1answer 642 views ### Misconception? “That gas is heavier so it sinks.” I've heard people say many times that one gas is heavier than the other so the heavier gas sinks. Now this must certainly be true to a certain extent (I think of gas used in WWI that sunk into ... 1answer 405 views ### Determine balloon diameter needed to lift a 7 pound weight with various gases My question is regarding setting up this equation. The givens are as follows: Gases are helium, methane and hydrogen. (Test all three) Assume balloon is spherical. Assume temperature is 25~\mathrm{^\... 1answer 108 views ### Specific gravity of H2O2 bleached viscose [closed] What is the specific gravity of \ce{H2O2} bleached viscose? In literature, I can find that this is 1.52~\mathrm{g~cm^{-3}}, but for bleached viscose is it not findable. Can I presume \ce{H2O2} ... 0answers 53 views ### Specify the formula of the product X_n Y_m [closed] During a chemical reaction, equal moles of two diatomic molecules \ce{X} and \ce{Y} are allowed to react to form one gaseous compound \ce{X_nY_m}. After the reaction is complete, it was observed ... 3answers 229 views ### Two liquids that react to produce a gas less dense than air at room temperature Does anybody know two liquids (or a solid and a liquid) that can react to produce a gas less dense than air (or similar) at room temperature? This question is intended to make a chemical induced ... 1answer 1k views ### What is the density of compressed natural gas (CNG) used in vehicles? [closed] I would like to know the density of the compressed natural gas used for natural gas vehicles in order to complete the formula in this Mathematics Stack Exchange post. 1answer 6k views ### Calculating the volume of 1 mole of liquid water I am doing some rough calculations to test my understanding of elementary chemistry. In what follows, I calculate the volume of one mole of liquid water at about \pu{4 ^\circ C} and \pu{1 atm}: ... 1answer 200 views ### Density of water and temperature Is there a formula that shows how the density of water is affected by temperature? For example, with the speed of sound it can be shown how temperature will affect the speed:$$V = 331\ \mathrm{m/...
Assuming an ideal gas, calculate the density in $\mathrm{g/cm^3}$ of propane, $\ce{C3H8}$ at $0.000~^\circ\mathrm{C}$ and $1.000~\mathrm{atm}$. (3 significant figures) I have figured out that I need ...