QuestionJune 20, 2025

The number of moles present in 180 grams of hydrochloric acid is approximately __ 4.75 5.00 4.25 4.50

The number of moles present in 180 grams of hydrochloric acid is approximately __ 4.75 5.00 4.25 4.50
The number of moles present in 180 grams of hydrochloric acid is approximately __ 4.75 5.00 4.25 4.50

Solution
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Answer

4.93 Explanation 1. Calculate Molar Mass of HCl The molar mass of HCl is the sum of the atomic masses of hydrogen (H) and chlorine (Cl). Hydrogen is approximately 1 g/mol, and chlorine is approximately 35.5 g/mol. Therefore, the molar mass of HCl is **36.5 g/mol**. 2. Calculate Number of Moles Use the formula for moles: **n = \frac{mass}{molar\ mass}**. Substitute the given values: \( n = \frac{180}{36.5} \). 3. Perform Calculation Calculate \( n = \frac{180}{36.5} \approx 4.93 \).

Explanation

1. Calculate Molar Mass of HCl<br /> The molar mass of HCl is the sum of the atomic masses of hydrogen (H) and chlorine (Cl). Hydrogen is approximately 1 g/mol, and chlorine is approximately 35.5 g/mol. Therefore, the molar mass of HCl is **36.5 g/mol**.<br /><br />2. Calculate Number of Moles<br /> Use the formula for moles: **n = \frac{mass}{molar\ mass}**. Substitute the given values: \( n = \frac{180}{36.5} \).<br /><br />3. Perform Calculation<br /> Calculate \( n = \frac{180}{36.5} \approx 4.93 \).
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