This pressure is in atmospheres, so we need to multiply by the conversion factor What is the partial pressure (in torr) of 1.00 mol of an ideal gas at 25 oC if its volume is 2.00 L? Or maybe you want to solve for pressure, and the value you need is torr. The volume of 1.0 mol of an ideal gas with a partial pressure of 1.0 atm at 15 oC is 23.6 L. What is the volume of 1.00 mol of an ideal gas at 15 oC if its partial pressure is 1.00 atm? You can do math as you define your variables. On homework and exams you probably won't getįull credit if you answer "22.40178759." That's simply not correct, because it's too precise!) (You have to think about precision and do the rounding off yourself. Whatever is there already and then (F5 on the TI-85 or TI-86 F2 on the TI-89) to solve. Then go to the line for the variable you DON'T know and press to erase What is the volume of 1.00 mol of an ideal gas at 273 Kelvin if its partial pressure is 1.00 atm?Įnter the values of all of the variables you know. Clear out the equation and load it again. If the first line reads "exp:IDEAL" and the second line reads "exp=" you have a TI-85 or TI-86Īnd forgot the strokes. The values will persist even after the calculator is turned off. Some of these variables may have numbers after them,ĭepending upon what already may be defined in your calculator. (If the upper bound is different from this, change it now.) (The heading "eqn:" does not show on the TI-89.) Be alert to this, and if youĮxpect a number larger than 1 x 10 14, be sure to adjust the upper bound EACHĪfter loading the equation into the solver, you should see something like the following. Upper bound is not large enough for many of our problems. On the TI-89 calculator you have to be especially careful with the bounds. You should now see a screen that looks like this: ĭon't forget ! (If you forget these strokes, you can solve the equation, but you can't see what you're solving!) The "IDEAL" key will appear as one of the "soft" function keys up near the screen, probably. You can't just write "ln Q" as you can with the TI-85 or TI-86. Note that on the TI-89 you must show all multiplications explicitly with "*" andĪll functions must have parentheses. We use "d" instead of just because "d" is easier to enter from the keyboard.Īlso, "ln" is from pressing.
Two other equations you might want to save include: Now to save this equation as IDEAL, press Note that we use 'mol' instead of 'n' in the ideal gas law because 'n' might be used for all sorts of other meanings in other equations. This is a bit of a pain, as you have to be careful to use the key prior to each letter. You should see a screen that looks like this: To get started with the TI-89, first enter the solver. In each case, after pressing the calculator should respond with "done." In addition, we use "d" instead of just because "d" is easier to enter from the keyboard.įREE = dG = dHo - T(dSo - R Q) We use two versions of the ideal gas constant, 'Rg' and 'R', so that we can have one ideal gas constant (Rg) in units of L-atm/mol-K and one (R) in terms of Joules/mol-K. Note that we use 'mol' instead of 'n' in the ideal gas law because 'n' is not allowed as a variable on some calculators. You will not have to enter them again for the life of the calculator. This is a bit of a pain, as you have to be careful to use the key (for uppercase) and keys (for lowercase).īut the payoff will be worth the trouble, because once these equations are in your calculator,
To get started, enter the following with upper/lower case exactly as shown below. You can enter those equations into your TI calculator. See also examples involving equilibrium and Boltzmann distributionĪnother web page you might be interested in is Make sure you read the section corresponding to your calculator. Note, the TI-89 makes no distinction between upper and lower case. TI-85 or TI-86 prior to each letter, then the key for that letter With the TI-89, these will be lowercase.Į q n (lowercase letters) press on the TI-89 or on the IDEAL (uppercase letters) press prior to each letter, There is a similar chapter for the TI-89. If you have a TI-85 or TI-86, you might want to check out the complete chapter Using Your TI-85, TI-86, or TI-89 Equation Solver Using Your TI-85,
0 kommentar(er)
