find the total charge in 50 kg of protons
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Charge on single proton=+1.6E-19 coulomb, with mass=1.67E-27kg.

The number of protons in 50kg=50/1.67E-27~3E28.

So the charge on 3E28 protons=3E28(1.6E-19)=4.8E9 coulomb (4.8 billion coulomb).
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