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Calculate the pH in a solution prepared by dissolving 0.14mol of solid NH4Cl in 0.480L of 0.35M NH3. Assume that there is no volume change? Why is it difficult for animals of one population (living in the same are) to become different species from one another? Evaluate
2sin^2(225)-tan(155)? As composition switches from copper to silver, the resistance? What is the standard form equation of the ellipse that has vertices (plus minus sign 7,0) and foci (plus minus sign 4,0)?