Chapter 1, Problem 47RGQ

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# When you heat popcorn, it pops because it loses water explosively. Assume a kernel of com, with a mass of 0.125 g, has a mass of only 0.106 g after popping.(a) What percentage of its mass did the kernel lose on popping?(b) Popcorn is sold by the pound in the United States. Using 0.125 g as the average mass of a popcorn kernel, how many kernels are there in a pound of popcorn? (1 lb = 453.6 g)

(a)

Interpretation Introduction

Interpretation: The mass percentage upon popping has to be given.

Concept Introduction:

Mass percentage:

One way of representing the concentration of an element in a compound or a component in a mixture.

Explanation

The mass percentage of the compound is calculated as,

â€‚Â Given:Â Â Â massÂ ofÂ aÂ kernelÂ cornÂ (m1)Â =Â 0.125Â g;Â massÂ afterÂ poppingÂ Â (m2)Â =Â 0.106Â gCalculateÂ massÂ percentage:_Massâ€‰<

(b)

Interpretation Introduction

Interpretation: The number of kernels present in pound of popcorn has to be given.

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