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What is the binding energy of the electron in kJ/mol? Note that KE= 1/2 mv^2 and 1

electron volt (eV) + 1.602 x 10^-19 J.

Express your answer using three significant figures.


The energy required to ionize boron is 801 kJ/mol

What minimum frequency of light is required to ionize boron?

Express the minimum frequency in inverse seconds to three significant figures.


How many kilometers can the car travel on the amount of gasoline that would fit in a soda can? The volume of a soda can is 355 mL

Express your answer using two significant figures.


Write isotopic symbols of the form X−A (e.g., C−13) for each isotope.

The sulfur isotope with 16 neutrons

Enter the chemical symbol of the isotope.

The sulfur isotope with 18 neutrons

Enter the chemical symbol of the isotope.

The plutonium isotope with 146 neutrons

Enter the chemical symbol of the isotope.

The hydrogen isotope with 1 neutron

Enter the chemical symbol of the isotope.

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