Calculate the mass of 1.20*10^25 molecules of fluorine

Your Dummm

Explanation:

19.969

moles or

20.0

moles using significant figures

Explanation:

A mole is a unit of measurement, but more specifically, it is an amount. Just like a dozen of a thing means 12 things, a mole measures the amount of something. The number of a certain thing in a mole is

6.022

⋅

10

23

; that number is called Avogadro's number. So a mole of potatoes is

6.022

⋅

10

23

potatoes, or a mole of cars is

6.022

⋅

10

23

cars.

This can be applied to chemistry to help convert between atoms to grams. The beauty of Avogadro's number is that

6.022

⋅

10

23

molecules of a certain compound weighs its atomic mass in grams. For example, iron trichloride

F

e

C

l

3

has an atomic mass of 162.195. So a mole of

F

e

C

l

3

weighs 162.195 grams.

Now that the concept of moles is established, you know that a mole of anything has

6.022

⋅

10

23

things in it. For phosphorous or any chemical compound, a mole contains

6.022

⋅

10

23

molecules in it. So if you have

1.20

⋅

10

25

(that's what I assume you meant) atoms of phosphorous, then just divide by Avogadro's number to find the number of moles.

1.20

⋅

10

25

A

T

O

M

S

6.022

⋅

10

23

A

T

O

M

S

M

O

L

You would get

19.969

moles. (Notice how when you simplify the units, you will end up with just moles which is the right unit.)

Explanation:

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.