- Find a two-digit numbers that equals two times the result of multiplying its digits.?

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The half life for a first order reaction is 32 s. What was the original concentration if after 2 min the reactant concentration is 0.062 M? I want to find the value of k by this equation: Ct = C0. k. e^(-kt).
The values of Ct, C0 and t are known.
How should I solve this? How does the circuit work ? The fact that the absorption and emission spectra of atoms and their ions are different is evidence that the spectra are due to .....? Two identical spheres experience charge F. Each lose 1/4 of initial charge. What is the electrostatic force on each one. Distance = constant?