Density Lab B

[UTF-8 U+6211 U+662F]

Do any of you know if there are any practice tests for Density Lab?

syo_astro's SSSS test on the test exchange

(although there were rule changes between now and then)

[Incineroar999]

Is this event math related?

[UTF-8 U+6211 U+662F]

Is this event math related?

Yes. Very. Although nothing complicated, more like multiplication and division.

[gl10086]

Are there certain tools or materials I need to know how to use for this event?

[MattChina]

Are there certain tools or materials I need to know how to use for this event?

Probably just know how to use a ruler or read a graduated cylinder.

[Incineroar999]

Does anyone know what materials we need for the density lab?

[UTF-8 U+6211 U+662F]

Does anyone know what materials we need for the density lab?

A binder, writing materials, and calculators

[bobthebuilderman]

What is 1 mol of gas at STP equal too?

The wiki says that its 22.71 L. https://scioly.org/wiki/index.php/Densi ... ro.27s_Law
Simply looking it up, says its 22.4 L.

Which do I believe?

Thanks,
Bob

[Unome]

What is 1 mol of gas at STP equal too?

The wiki says that its 22.71 L. https://scioly.org/wiki/index.php/Densi ... ro.27s_Law
Simply looking it up, says its 22.4 L.

Which do I believe?

Thanks,
Bob

22.4 L / mol is the value for an ideal gas (calculated from PV=nRT). A calculation that better approximates a real gas, such as the van der Waals equation, may have a different value - I suspect that's where 22.71 comes from. In general, I would recommend using 22.4 since it's more commonly cited. see the next post

[John Richardsim]

What is 1 mol of gas at STP equal too?

The wiki says that its 22.71 L. https://scioly.org/wiki/index.php/Densi ... ro.27s_Law
Simply looking it up, says its 22.4 L.

Which do I believe?

Thanks,
Bob

22.4 L / mol is the value for an ideal gas (calculated from PV=nRT). A calculation that better approximates a real gas, such as the van der Waals equation, may have a different value - I suspect that's where 22.71 comes from. In general, I would recommend using 22.4 since it's more commonly cited.

The 22.71 L/mol uses 1 bar for STP (used by IUPAC since 1982), whereas 22.41 L/mol uses 1.01325 kPa for STP (used before 1982).

If in doubt, be sure to state the specific conditions for STP that you are using.