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8. Calculate the number of moles of H2O formed when 0.200 mole of Ba(OH)2 is treated with 0.500 mol of HClO3 according to the chemical reaction shown below.
Ba(OH)2 + 2 HClO3 → Ba(ClO3)2 + 2 H2O
(A) 0.400 mol
(B) 0.600 mol
(C) 0.500 mol
(D) 1.00 mol
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9. Which of the following has a greater mass:
(A) 2 atoms of potassium (K)
(B) 5.1 x 10-23 mole of helium (He)
(C) 1 mole of magnesium (Mg)
(D) all of the elements are equal in masses
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10. How many milliliters would you need to prepare 60.0 mL of 0.200 M HNO3 from a stock solution of 4.00 M HNO3?
(A) 3 mL
(B) 60 mL
(C) 24 mL
(D) 1000 mL
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