A 25.0 mL solution of Ba(OH)₂ is neutralized with 20.9 mL of 0.250 M HBr. What is the concentration of the original Ba(OH)₂ solution?

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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A 25.0 mL solution of Ba(OH)₂ is neutralized with 20.9 mL of 0.250 M HBr. What is the concentration of the original Ba(OH)₂ solution?

How many milliliters of 0.0190 M Sr(OH)₂ are required to neutralize 65.0 mL of 0.0400 M HCl?

Ammonia reacts with O₂ to form either NO(g) or NO₂(g) according to the following UNBALANCED equations: NH₃(g) + O₂(g) → NO(g) + H₂O(g) NH₃(g) + O₂(g) → NO₂(g) + H₂O(g) In one experiment 6.00 moles of NH₃(g) and 15.00 moles of O₂(g) were placed in a closed flask and allowed to react. After the reaction was complete, 6.75 moles of O₂(g) remained and all of the NH₃(g) had reacted. Calculate the number of moles of NO(g) formed in the reaction mixture.

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