## Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning

# Let's Review: The Tools of Quantitative Chemistry - Study Questions - Page 43b: 27

#### Answer

See file for graph From graphing the graph Slope: $0.1637$ g/kernel Slope represents the average mass of a popcorn kernel Mass of 20 popcorn kernels = $3.370g$ There are 127 kernels in a sample with a mass of $20.88g$ #### Work Step by Step

To make the graph you can use a linear regression on a calculator From the linear regression the equation that you are given the slope is the number that is the coefficient to the $x$ To determine the mass of 20 popcorn kernels: $\frac{20 popcorn kernels}{1}$ * $\frac{0.1637g}{1 kernel}$ = $3.370g$ To determine how many kernels are in a sample with a mass of $20.88g$ $\frac{20.88g}{1}$ * $\frac{1 kernel}{0.1637g}$ = $127$ kernels

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