# Mass Of Chlorine

A 'weighted average' allows for the fact that there won't be equal amounts of the various isotopes. The example coming up should make that clear.

Suppose you had 123 typical atoms of boron. 23 of these would be 10B and 100 would be 11B.

### Mass Of Chlorine Kg

Chlorine (Cl - Standard atomic weight), molar mass. Chlorine is a chemical element with symbol Cl and atomic number 17. It is the second lightest halogen, following fluorine. The most common compound of chlorine, sodium chloride (common salt), has been known since ancient times. Cl2 (g) is the natural form that chlorine exists in. If they ask the mass of 1 molecule of chlorine gas, it would be 71g. But since you are calculating empirical formula, you want the mass of. 2020-11-21 by Nick Connor Atomic Mass of Chlorine Atomic mass of Chlorine is 35.453 u.

The total mass of these would be (23 x 10) + (100 x 11) = 1330

The average mass of these 123 atoms would be 1330 / 123 = 10.8 (to 3 significant figures).

10.8 is the relative atomic mass of boron. Notice the effect of the 'weighted' average. A simple average of 10 and 11 is, of course, 10.5. Our answer of 10.8 allows for the fact that there are a lot more of the heavier isotope of boron - and so the 'weighted' average ought to be closer to that.

### Mass Of Chlorine 37

The mass spectrum for zirconium

The number of isotopes

The 5 peaks in the mass spectrum shows that there are 5 isotopes of zirconium - with relative isotopic masses of 90, 91, 92, 94 and 96 on the 12C scale.

The abundance of the isotopes  This time, the relative abundances are given as percentages. Again you can find these relative abundances by measuring the lines on the stick diagram.

### Mass Of Chlorine Atom

In this case, the 5 isotopes (with their relative percentage abundances) are: