Multiple Choice
How many moles are present in 2.5 g of N_2?
2. Atoms & Elements
Mole Concept
Multiple Choice
A solution has a concentration of 0.025 M HCl. How many moles of H+ are present per liter in this solution? (Use the decimal form of your answer.)
A
0.25
B
0.0025
C
0.025
D
0.050
Verified step by step guidance1
Identify the species that contribute H+ ions in the solution. Since HCl is a strong acid, it dissociates completely into H+ and Cl- ions in water.
Write the dissociation equation for HCl: \(\mathrm{HCl} \rightarrow \mathrm{H^{+}} + \mathrm{Cl^{-}}\).
Recognize that for every 1 mole of HCl dissolved, 1 mole of H+ ions is produced because the dissociation is complete and the ratio is 1:1.
Use the given concentration of HCl, which is 0.025 M, meaning 0.025 moles of HCl per liter of solution.
Since the molar ratio of HCl to H+ is 1:1, the concentration of H+ ions is also 0.025 moles per liter.
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