# 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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### 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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### 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?
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### Density of cyclic hydrocarbons

Why is the density of cyclic hydrocarbons more than that of their acyclic counterparts? For ex: ...
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### 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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### 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 ...
559 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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### 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 ...
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### 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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### 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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### 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 ...
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### 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 ...
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### 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 ...
118 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 ...
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### 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 ...
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### 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?
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### 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 ...
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### 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
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### 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 ...
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### 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 ...
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### 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!
338 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 ...
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### 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/...
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### How do I calculate the density of propane assuming an ideal gas?

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 ...
The total area of $\pu{0.5 g}$ sample of $\ce{KCl}$ powder is measured to be $\pu{1620 cm2}$. If the powder consists of tiny cubic crystals, what is the average size of these crystals? I'm studying ...