Molar Mass Calculator – TI-84 Evo Chemistry Program

Type a chemical formula and this program gives you its molar mass in g/mol, plus the percent by mass of each element.

By CalcPlex.

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Plug the calculator into your computer with a USB cable, then use the button below. If something is not working, see troubleshooting.

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Press the prgm key. The PROGRAMMING menu opens.
Press enter to select TI-Basic. The list of TI-Basic programs opens.
Press enter on MOLMASS in the program list, which puts prgmMOLMASS on the home screen.
Press enter to run it. The program asks for the formula.

Find the molar mass of urea, CO(NH₂)₂.

Type CO(NH2)2 in capital letters. Press alpha before each letter. The calculator has no lowercase letters, so formulas go in as capitals.
Press enter. In capitals, CO could be carbon and oxygen or cobalt, so the program asks which one you mean.
Select Carbon, oxygen. The answer prints as CO(NH2)2=60.056 g/mol, with the percent by mass of carbon, oxygen, nitrogen and hydrogen under it.

The answer line shows the formula the way the program read it, in normal case, so you can check it before you copy the number down.

To do another formula, press enter on the home screen right after an answer. The program runs again.

It asks whenever capitals could mean two things. That happens with CO, CS, SC, NI, OS and BI. For Sc₂(SO₄)₃, type SC2(SO4)3 and select Scandium to get 378.08 g/mol.
The molar mass stays in Ans for mole problems. To find the mass of 2.86 mol of Co(NH₃)₆Cl₃, type CO(NH3)6CL3, select Cobalt, then press × 2 . 8 6 enter. That gives 764.96 grams. Going the other way, divide your grams by M, which also holds the molar mass.
Hydrates and complex ions work too. Use the × key for the dot in a hydrate: CUSO4×5H2O comes back as CuSO4·5H2O, 249.677 g/mol. Square brackets (2nd then −, 2nd then +) count as parentheses, so K3[FE(CN)6] gives 329.247 g/mol for K₃[Fe(CN)₆].