Gas Laws TI-84 Plus CE Program: Complete Guide
Gas Laws Calculator
for TI-84 Plus CE
Every gas law. Any variable. Solve Ideal, Boyle's, Charles's, Gay-Lussac's, Avogadro's, Combined, Full Combined, Dalton's, and RMS Velocity — all from one program on your TI-84 Plus CE.
See It in Action
Watch a full walkthrough of the main menu, MORE Functions menu, and a complete Ideal Gas Law problem solved step by step.
Everything in One Program
GASLAWS9 consolidates the entire AP Chemistry gas laws unit into a single, menu-driven program. No equation rearranging. No unit confusion. Just enter what you know and get what you need.
Law-by-Law Breakdown
Each law displays its formula right in the menu header — so you always know you're in the right place before you start entering values.
Ideal Gas Law
Solve for any of the four variables: pressure, volume, moles, or temperature. Choose from three built-in R values — the program handles units automatically based on your selection.
Boyle's Law
Pressure and volume change at constant temperature and moles. Solve for any of the four variables. The menu title shows the formula so you can confirm you're in the right law before entering values.
Charles's Law
Volume and temperature change at constant pressure and moles. Temperature must be entered in Kelvin — the built-in help screen reminds you of the conversion formula T(K) = T(°C) + 273.15.
Gay-Lussac's Law
Pressure and temperature change at constant volume and moles. All four variables solvable. Useful for problems involving sealed containers heated or cooled between two states.
Avogadro's Law
Volume and moles change at constant temperature and pressure. Useful for problems involving gas added or removed from a container at fixed conditions.
Combined Gas Law
Combines Boyle's, Charles's, and Gay-Lussac's into one equation — use when pressure, volume, and temperature all change between two states, while moles stay constant.
Full Combined Law
The most powerful section in the program. This is the Complete Gas Law — all four variables (P, V, n, and T) can change between two states. Ideal for problems where gas is escaping, being added, or transferred between containers.
Solve for any of the eight variables across both states:
When to use Full Combined Law instead of Combined Gas Law:
✓ Gas is leaking out of or being added to a container
✓ Gas is transferred between two systems
✓ The amount of substance (n) is different between the two states
✓ Any problem that gives you both n₁ and n₂ as different values
MORE Functions
Beyond the six gas laws, the program includes three additional tools accessible from the MORE Functions menu — plus a built-in Gas Constant reference screen you'll want to bookmark.
Mixed Gas Pressure
Enter the mass and molar mass of 2–4 gases, plus volume and temperature, and the program calculates total pressure. Choose atm, kPa, or mmHg for output. All mol calculations handled internally.
RMS Velocity
Root-mean-square speed of gas molecules. Enter molar mass in g/mol and temperature in Celsius — the program automatically converts to kg/mol and Kelvin and uses R = 8.314 J/mol·K. Returns velocity in m/s.
Gas Constant R Reference
A quick-reference screen showing all four R values (atm, kPa, mmHg, bar) and STP molar volumes at both 1 atm (22.414 L/mol) and 1 bar (22.711 L/mol). No more digging through your notes.
Built-In Help System
The Gas Laws Calculator includes multiple help screens accessible from within the program — no need to leave the calculator to look something up.
📖 Main Help Screen
Covers all gas laws with a quick summary of which variables change and which stay constant. Includes the Kelvin conversion reminder and a guide to the MORE Functions menu.
🔢 Ideal Gas Law Help
Dedicated help for PV = nRT — which R to use with which unit system, why temperature must be in Kelvin, and how to match units throughout a problem.
⚡ Full Combined Law Help
Explains the Full Combined Law formula, when to use it versus the standard Combined Law, and common problem types it applies to — like gas escaping or being transferred.
📐 Formula Display in Every Menu
Every law submenu shows its formula as the header title, so you can confirm you're in the right section before entering a single number.
Complete Feature List
Everything the Gas Laws Calculator covers in one place.
- Ideal Gas Law (PV = nRT) — solve for P, V, n, or T with R choice (atm, kPa, mmHg)
- Boyle's Law (P₁V₁ = P₂V₂) — solve for P1, V1, P2, or V2
- Charles's Law (V₁/T₁ = V₂/T₂) — solve for V1, T1, V2, or T2
- Gay-Lussac's Law (P₁/T₁ = P₂/T₂) — solve for P1, T1, P2, or T2
- Avogadro's Law (V₁/n₁ = V₂/n₂) — solve for V1, n1, V2, or n2
- Combined Gas Law (P₁V₁/T₁ = P₂V₂/T₂) — solve for any of 6 variables
- Full Combined Law (P₁V₁/n₁T₁ = P₂V₂/n₂T₂) — solve for any of 8 variables across both states
- Mixed Gas Pressure — Dalton's Law for 2–4 gases (mass + molar mass input)
- RMS Velocity — v = √(3RT/M), auto-converts g/mol → kg/mol and °C → K
- Gas Constant R reference — all 4 R values plus STP molar volume at 1 atm and 1 bar
- Built-in error checking — catches zero denominators, negative temperatures, invalid inputs
- 4 help screens — main help, Ideal Gas Law help, Full Combined Law help, MORE Functions help
- Formula displayed in every submenu header — no more guessing which law you're in
- New Calc / Back / Main navigation after every result — no restarting needed
Compatible Calculators
This is a TI-BASIC program designed specifically for the color-screen TI-84 Plus CE family.
Delivery is instant digital download (.8xp file). You'll need TI Connect CE software and a USB mini cable to transfer. Full install guide here →
Also Included in These Bundles
The Gas Laws Calculator is part of several chemistry and science bundles. If you're covering more than just gas laws, a bundle gives you far more coverage for less.
Complete Chemistry Bundle
The most comprehensive chemistry package — includes the Gas Laws Calculator plus the full suite of AP Chemistry programs covering stoichiometry, thermochemistry, equilibrium, acids & bases, and more.
View Bundle →AP Science Mega Bundle
Chemistry + Physics in one bundle. Includes the Gas Laws Calculator plus AP Physics and AP Chemistry programs for students doubling up on science APs.
View Bundle →AP STEM Mega Bundle
The full catalog — Chemistry, Physics, Calculus, and more. Includes the Gas Laws Calculator plus every other program in the MCS Tutoring library.
View Bundle →Ready for the AP Exam?
Get the Gas Laws Calculator and stop rearranging gas law equations by hand. Spend that time understanding chemistry instead.
Get it at mcstutoring.com →Instant digital download · Works on TI-84 Plus CE & CE Python
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