Find the molar mass of a compound

The molar mass is 74.092 g/mol. The screen prints the number without a unit. Check it using the table's atomic weights:

The fraction and decimal are the same value. The inserted AtWt tokens represent the atomic weights; you do not type those tokens yourself.

To show just the decimal, press S⇔D.

If your textbook rounds Ca to $40$, O to $16$ and H to $1$, it gives $74g/mol$. That difference comes from rounding the atomic weights.

• A message appears under the field: “Symbols start with a capital: H2O” means a symbol needs its capital (Ca, not ca); “Unknown element: Xx” means that symbol is not an element, so correct it; “Check the formula” means a problem such as a missing closing bracket. Edit the text in the field; nothing has been inserted yet.
• The formula looks right but gives a different number: check the letter O against the digit zero. H20 means twenty H atoms and gives $20.16$; water is H2O and gives $18.015$.
• The calculator's digit keys do nothing: while the table is open they are switched off, so type the formula with your keyboard.
• You want to cancel: with the formula field open, press AC once to close the field and again to close the table. Your calculation line is left as it was.
• You already inserted the wrong formula: press AC to clear the line, then open the table again. One DEL removes only the closing bracket, not the whole inserted sum.
• The table does not open, or its row is missing: the table works only on the ordinary calculation screen, where the calculator opens. In another mode such as Distribution, the ES/EX row is offered but does nothing, and the CW has no Atomic Table row. The row is also hidden when the Advanced keypad is off: turn it on.