QuestionMay 10, 2025

Chlorous acid. HClO_(2) contains what percent hydrogen by mass? 1.92% 25.0% 23.4% 1.47% 5.18%

Chlorous acid. HClO_(2) contains what percent hydrogen by mass? 1.92% 25.0% 23.4% 1.47% 5.18%
Chlorous acid. HClO_(2) contains what percent hydrogen by mass? 1.92% 25.0% 23.4% 1.47% 5.18%

Solution
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Answer

1.50\% Explanation 1. Calculate Molar Mass of HClO_2 Hydrogen (H): 1.01 g/mol, Chlorine (Cl): 35.45 g/mol, Oxygen (O): 16.00 g/mol. Total molar mass = 1.01 + 35.45 + 2 \times 16.00 = 67.46 g/mol. 2. Calculate Percent Hydrogen by Mass **Percent by mass formula**: \frac{\text{mass of element in 1 mole}}{\text{molar mass of compound}} \times 100\%. For hydrogen: \frac{1.01}{67.46} \times 100\% = 1.50\%.

Explanation

1. Calculate Molar Mass of $HClO_2$<br /> Hydrogen (H): 1.01 g/mol, Chlorine (Cl): 35.45 g/mol, Oxygen (O): 16.00 g/mol. Total molar mass = $1.01 + 35.45 + 2 \times 16.00 = 67.46$ g/mol.<br /><br />2. Calculate Percent Hydrogen by Mass<br /> **Percent by mass formula**: $\frac{\text{mass of element in 1 mole}}{\text{molar mass of compound}} \times 100\%$. For hydrogen: $\frac{1.01}{67.46} \times 100\% = 1.50\%$.
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