Question

When you heat a popcorn, it pops because it loses water explosively. Assume a kernel of corn, with a mass of 0.136g has ...


When you heat a popcorn, it pops because it loses water explosively. Assume a kernel of corn, with a mass of 0.136g has a mass of only 0.101g after popping. 
1. What percentage of its mass did Kernal lose on popping? 
2. Popcorn is sold by the pound in the United States. Using 0.136g as the average mass of the popcorn kernel, how many kernel are there in a pound of popcorn?

Answer

Given:

Mass of kernel of corn before heating = 0.136 g

Mass of kernel of corn after heating (on popping) = 0.101 g

 

1.

Calculation for percentage of loss of Mass of kernel of corn after heating (on popping):

Chemistry homework question answer, step 2, image 1

Unit conversion from g to pound:

1 g = 0.00220462 pound

0.136 g = 0.00029982868 pound

Calculation for number of kernels of corn in 1 pound:

Chemistry homework question answer, step 4, image 1

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