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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1answer
108 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?
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1answer
79 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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146 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
266 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
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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3answers
332 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 ...
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0answers
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 ...
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2answers
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?
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1answer
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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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1answer
57 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 ...
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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 ...
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1answer
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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2answers
552 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 ...
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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?
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1answer
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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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1answer
363 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
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3answers
45k 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 ...
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4answers
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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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1answer
180 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!
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1answer
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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2answers
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 +...
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1answer
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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1answer
755 views

Conversion of grams to milliliters using kg/m3 density

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{...
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2answers
536 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 ...
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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 ...
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1answer
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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 ...
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1answer
377 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 ...
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1answer
416 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 ...
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1answer
65 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.
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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-...
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2answers
137 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 ...
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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 ...
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1answer
974 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 ...
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1answer
52 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 ...
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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?
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1answer
192 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 ...
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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 ...
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2answers
111 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 ...
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1answer
608 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 ...
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1answer
402 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{^\...
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1answer
107 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 $\ce{H2O2}$ ...
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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 ...
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3answers
218 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 ...
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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.
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1answer
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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 $\pu{1 atm}$: ...
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1answer
193 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/...
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1answer
4k views

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 ...
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1answer
44 views

How to calculate the average size of cubic crystals of KCl powder? [closed]

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 ...
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Which is the densest gas known?

Which is the densest gas known to exist under normal "shirt sleeve" conditions: room temperature, one atmosphere, won't explode on contact with air, won't kill everyone in the building in trace ...