Chemistry 11–12 · Year 11
Weighing 50 mL of different gases: Avogadro's law and relative molecular mass from the ideal gas equation
Module 2: Introduction to Quantitative Chemistry
Teacher-led demonstration
A teacher carries out this activity as a demonstration. Its materials, steps, variables, misconceptions and sources are not published on the open web, and neither is any result, control or note that states a number or an amount: tutors and administrators read them on the learning platform, with the safety card first. The idea, the hazards and the curriculum references are below.
Open the procedure on the learning platform (tutor or administrator sign-in)
School laboratory, not for home
In a school laboratory, with a teacher supervising, under the school's risk assessment. Not for home.
This site has no interactive model of its own. Where a step or a material names a Concept Studio model, simulation or tool, it has not been built; an external simulation a step names (for example PhET) is not part of this site.
The idea
Equal volumes of gases at the same temperature and pressure hold equal numbers of molecules, so the mass of a fixed volume is proportional to the molar mass.
Safety card
Setting: In a school laboratory, with a teacher supervising, under the school's risk assessment. Not for home.
Hazards
- hypodermic needle
- hydrogen and methane are flammable
- carbon dioxide generation pressure
Controls
- needle handled by the teacher and stored capped
- no flames during hydrogen or methane handling
- gases collected in bags, not cylinders under pressure, unless a regulator is fitted
- eye protection
Note
It states a number or an amount, which may be part of the method, so it is shown with the method to tutors and administrators on the learning platform.
What you should see
It states a number or an amount, which may be part of the method, so it is shown with the method to tutors and administrators on the learning platform.
Curriculum references
The NSW syllabus outcomes and Australian Curriculum v9 codes this activity supports. They are references, not a verified or complete curriculum alignment.
- Chemistry Stage 6 Syllabus (2017), NESA; the current syllabus, taught in 2026 (codes read from the syllabus document)CH11-9CH11/12-4CH11/12-6
- Chemistry 11-12 Syllabus (2025), NESA; implemented from 2028, not yet taughtCH-11-02CH-11WS-04CH-11WS-06
- Australian Curriculum v9No Australian Curriculum v9 code is listed.