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.

Filter by
Sorted by
Tagged with
24
votes
3answers
12k views

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 ...
7
votes
3answers
8k views

Would equal masses of gold and copper result in the same volume change if added to water?

Would equal masses of gold and copper result in the same volume change if added to water? Density of gold: $19.3~\mathrm{g/mL}$ Density of copper: $8.96~\mathrm{g/mL}$ I was thinking the answer ...
37
votes
6answers
62k views

Why do we use helium in balloons?

While I was looking at the periodic table today, I realised that there were gases that were much lighter than helium such as hydrogen. If hydrogen is lighter than helium, why do we insist on using ...
1
vote
1answer
742 views

What is the length of a unit cell of CuCl assuming that it is fcc?

The density of $\ce{CuCl}$ is given – $x\ \mathrm{g/cm^3}$ The crystal structure is assumed to be fcc. My teacher is claiming the we can apply the formula $$\rho=\frac{Z \cdot M}{a^3 \cdot N_\mathrm ...
6
votes
2answers
4k views

How can the density of water be maximised?

What is the maximum possible density of water at room temperature? The density of the water in the Dead Sea at 37°C is 1.24. Would it be possible to increase the density using salts we add to our food,...
5
votes
1answer
5k views

How can molecular mass be calculated from vapour density?

An organic compound contains 71.7% carbon, 6.7% hydrogen, 10.4% nitrogen and 11.8% oxygen by mass. Given that its vapour density is 67.5, determine its empirical formula and molecular formula. From ...
1
vote
1answer
4k views

Find the number of copper spheres in a box

A box contains a mixture of small copper spheres and small lead spheres. The total volume of both metals is measured by the displacement of water to be $\pu{420 cm^3}$ and the total mass is $\pu{5.4 ...