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How to calculate the pH of 735 liters of a solution containing 0.85 moles of HNO3?? On a 28,386 square feet lot how many acres is that? Convert x^2 + 2x + y^2 + 2y=0 to polar form? Are scorpions a good source of nutrients for human beings? Give all possible values of l for the second principal level (n = 2).?