What is the formula weight?

Question

What is the formula weight?

1 Answer

Impact of this question

2047 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-12-13T06:59:51

This is simply a calculation of the mass of one mole of a given substance.

Explanation:

Let's take a random formula, $C a C O_{3}$ $CaCO_3$ .

1 mole of calcium has a mass of $40.1 \cdot g$ $40.1*g$ ; 1 mole of carbon has a mass of $12.01 \cdot g$ $12.01*g$ ; 3 mole of oxygen has a mass of $3 \times 15.999 \cdot g$ $3xx15.999*g$ . Sum them together, and we get a so-called $formula mass$ $"formula mass"$ of $100.12 \cdot g \cdot m o l^{- 1}$ $100.12*g*mol^-1$ (i.e. units are $g \cdot m o l^{- 1}$ $g*mol^-1$ or $g \cdot {(Avogadro's Number)}^{- 1}$ $g*("Avogadro's Number")^-1$ of reagent).

From where did I get the atomic masses? Did I know them from memory? (In fact I did, and you'll get to know the common ones very rapidly.) This operation is something that you will do routinely and rapidly.

Science

Math

Humanities

... and beyond

What is the formula weight?

1 Answer

Explanation:

Related questions

Impact of this question