# Where did they get the 24.79 from in the last line of the solution ? (1 Viewer)

formula sheet

#### jazz519

##### Moderator
Moderator
The molar volume formula n = v/vm

Vm = 24.79 L/mol at 100 kPa and 25 C

This value is on data sheet

#### Hivaclibtibcharkwa

##### Well-Known Member
The molar volume formula n = v/vm

#### Siwel

##### Active Member
i think more of a yr 11 concept with the Pv=nrt

#### Hivaclibtibcharkwa

##### Well-Known Member
i think more of a yr 11 concept with the Pv=nrt
You think it’s worth learning?

#### Siwel

##### Active Member
You think it’s worth learning?
not rlly much to learn, just at 25 degrees or whatever the formula sheet says, 1mol of gas is this many litres

#### icycledough

##### Well-Known Member
It's only 2 formulas to remember, both of which are on the reference sheet.

At 0 degrees (STP), 1 mole of ideal gas has a volume of 22.71L and at 25 degrees (SLC), 1 mole of ideal gas has a volume of 24.79L. Note that for both, the pressure has to be fixed at 100kPa. If you struggle to remember SLC and STP, think of SLC (standard lab conditions) as what the temperature in a school lab would most likely be, and common sense would say it's closer to 25 degrees than 0 degrees (well, I hope so).

#### jazz519

##### Moderator
Moderator
It's basically pv=nRT but the pressure, temp and gas constant R are already subbed in. You can just use pv=nRT as well if you learnt it that way

That's how those two values on data sheet 22.71 and 24.79 are derived