From e545a0b4c2cae468d963963f0a6810777d862b5b Mon Sep 17 00:00:00 2001 From: eggy Date: Thu, 21 Jan 2021 09:17:36 -0500 Subject: [PATCH] chem: finish gas collection --- docs/sch3uz.md | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/docs/sch3uz.md b/docs/sch3uz.md index 1a66179..9d865e2 100644 --- a/docs/sch3uz.md +++ b/docs/sch3uz.md @@ -424,6 +424,18 @@ P\propto n \\ \frac{n_1}{n_T}P_T=P_1 $$ +Please see [SL Physics#Gas laws](/sph3uz/#gas-laws) for more information. + +### Gas collection + +**STP** refers to **standard temperature and pressure**, which is at $273\text{ K}$ and $100\text{ kPa}$. + +The gas collection process is used to experimentally determine the number of moles and/or mass of a gas. By adding a gas under water, the gas displaces the water as it moves up into a measuring cylinder and its volume can be taken. Ideally, the temperature of the gas is equal to the temperature of the water, and the its pressure is equal to that of the atmosphere. Since water vapour tends to evaporate, it has to be factored out using Dalton's law of partial pressures and a chart that gives the pressure of water at a given temperature. +$$P_T=P_{\text{H}_2\text{O}} + P_\text{gas}$$ + +(Source: Kognity) + + ## 2.1 - Atoms !!! definition