10. How many popcorn kernels have you determined to be equal to 1 PCU? If you were counting out 1 PCU of marbles, how many marbles would you count out? counting out 1 PCU of beans, how many beans would you count out? If you were 11. Count out 1 PCU of pinto beans. This will be the number of pinto beans equal to the number of kernels in one PCU. Use the balance to determine the mass of 1 PCU of pinto beans and record in the table below. 12. Finish filling out the data table below: Type of Particle Popcorn kernels Pinto beans White beans Number of particles in 1 PCU Mass of 1 PCU 4.80 2