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How many water towers are in the United states, and how much water can each hold on average, and how much water do they hold in total? Sinθ =1/4. tan θ >0 find cos θ/2? Write iupac name for following compound: C3H8,C3H6,C3H4? What is the relationship between atomic number and a atomic mass? What is the pH of a solution formed by mixing 0.500 L of 0.200 M HCl with 0.500 L of 0.400 M KOH?