# Question #dd146

##### 1 Answer

#### Explanation:

To find how many moles you get in one kilogram of silver you need to use silver's **molar mass**.

A substance's molar mass tells you what the exact mass of **one mole** of that substance is.

In silver's case, its molar mass is listed as

#"1 mole of Ag" -> "107.8682 g"#

All you have to do now is figure out how many moles would fit, so to speak, in one kilogram. Convert this mass from kilograms to grams first

#1color(red)(cancel(color(black)("kg"))) * "1000 g"/(1color(red)(cancel(color(black)("kg")))) = "1000 g"#

This means that you have

#1000color(red)(cancel(color(black)("g Ag"))) * "1 mole Ag"/(107.8682 color(red)(cancel(color(black)("g Ag")))) = "9.2706 moles Ag"#

of silver in one kilogram of silver.

I'll round this number off to two sig figs to get

#n = color(green)("9.3 moles Ag")#