شرح للكيمياء و أسئلة مراجعة

[ميشو كول]

ارجو من استاذتي حل الاسئله مع الشرح
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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