How many moles of chloride ions are in 7.75 g of FeCl3? (LO 3.4) (a) 4.78 * 10^-2 (b) 1.59 * 10^-2 (c) 1.43 * 10^-1 (d) 1.91 * 10^-1

검증된 단계별 안내

Step 1: Determine the molar mass of FeCl_3. Calculate the molar mass by adding the atomic masses of one Fe atom and three Cl atoms.

Step 2: Convert the given mass of FeCl_3 to moles. Use the formula: \( \text{moles of FeCl}_3 = \frac{\text{mass of FeCl}_3}{\text{molar mass of FeCl}_3} \).

Step 3: Determine the number of moles of chloride ions. Since each formula unit of FeCl_3 contains three chloride ions, multiply the moles of FeCl_3 by 3.

Step 4: Compare your calculated moles of chloride ions with the given options to identify the correct answer.

Step 5: Review the calculation steps to ensure accuracy and understanding of the process.

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주요 개념

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Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). To find the number of moles in a given mass of a compound, you first need to calculate its molar mass by summing the atomic masses of all the atoms in its formula. For FeCl3, the molar mass is calculated by adding the atomic mass of iron (Fe) and three times the atomic mass of chlorine (Cl).

Stoichiometry

Stoichiometry is the area of chemistry that deals with the relationships between the quantities of reactants and products in chemical reactions. In this context, it helps determine how many moles of chloride ions are produced from a given amount of FeCl3. Since each formula unit of FeCl3 contains three chloride ions, stoichiometry allows us to convert moles of FeCl3 to moles of Cl- ions.

Conversion of Grams to Moles

To convert grams of a substance to moles, you use the formula: moles = mass (g) / molar mass (g/mol). This conversion is essential for solving the problem, as it allows you to determine how many moles of FeCl3 are present in 7.75 g, which can then be used to find the corresponding moles of chloride ions based on the stoichiometric ratio.