# Question #d14a0

##### 1 Answer

#### Explanation:

You know that the chocolate bars contain **by mass** pecans. This means that you get **for every**

Your first step here will be to use the given percent concentration by mass as a *conversion factor* to calculate how many kilograms of chocolate bars will contain

#4.5 color(red)(cancel(color(black)("kg pecans"))) * "100 kg chocolate bars"/(22.0color(red)(cancel(color(black)("kg pecans")))) = 225/11color(white)(.)"kg chocolate bars"#

Now, in order to convert this to *pounds*, you need to use the fact that

#"1 kg " ~~ " 2.2046 lbs"#

You will end up with

#225/11 color(red)(cancel(color(black)("kg"))) * "2.2046 lbs"/(1color(red)(cancel(color(black)("kg")))) = color(darkgreen)(ul(color(black)("45 lbs")))#

The answer is rounded to two **sig figs**, the number of sig figs you have for the mass of pecans.