The “Chemistry in Focus." segment Snacks Need Chemistry, Too! discusses why popcorn “pops." You can estimate the pressure inside a kernel of popcorn at the time of popping by using the Meat gas law. Basically, you determine the mass of water released when the popcorn pups by measuring the mass of the popcorn both before and after popping. Assume that the difference in mass is the mass of water vapor lost on popping. Assume that the popcorn pops at the temperature of the cooking oil
suming a total volume of
Interpretation:
The pressure inside the Kernels should be calculated.
Concept Introduction:
The ideal gas law was purposed to explain all the properties of any ideal gas. The expression for ideal gas law can be shown as:
Here:
The volume and temperature values are given as follows:
Volume = 2.0 mL = 0.002 L
Temperature = 225 ° C = 225 + 273.15 = 498.15 K
Mass = 0.250 g
Molar mass of water = 18.0 g/mol
Number of moles can be calculated as follows:
Putting the values,
Now,
Plug the values in the ideal gas equation to calculate the pressure:
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