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What is the Schwarzschild radius, in kilometers, of a black hole whose mass is 3.06×10^8 MSun? Easy chem question: If the Ka of a monoprotic weak acid is 4.9 × 10-6, what is the pH of a 0.38 M solution of this acid? What companies are going to hire you as a analytical chemist? How do you compute the coefficients for n-dimensional linear regression? His effort is an A?