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Chemistry & Chemical Reactivity

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

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BuyFindarrow_forward

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,

  Given:   mass of a kernel corn (m1) = 0.125 g; mass after popping  (m2) = 0.106 gCalculate mass percentage:_Mass <

(b)

Interpretation Introduction

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

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