Complete the table below for calculating the molar mass of the ionic compound chromium(II) chloride. Cation Anion Formula Cr2+ CI Molar mass of ion g/mol g/mol X X Number of ions mol mol Molar mass chromium(II) chloride = || Mass of ion in one mole of chromium(II) chloride g/mol g 6
The Correct Answer and Explanation is :
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To calculate the molar mass of chromium(II) chloride (Cr2Cl2), we need to consider both the cation (Cr²⁺) and the anion (Cl⁻). Chromium (Cr) has a molar mass of approximately 52.00 g/mol, and chlorine (Cl) has a molar mass of about 35.45 g/mol.
In the formula Cr₂Cl₂:
- The cation, Cr²⁺, appears twice (since we have Cr2+), so we multiply its molar mass by 2.
- The anion, Cl⁻, also appears twice, so we multiply its molar mass by 2 as well.
Molar mass of Cr2+ = 52.00 g/mol × 2 = 104.00 g/mol
Molar mass of Cl- = 35.45 g/mol × 2 = 70.90 g/mol
When we add these values together, we get the molar mass of chromium(II) chloride:
104.00 g/mol + 70.90 g/mol = 174.90 g/mol.
So, the molar mass of chromium(II) chloride is approximately 174.9 g/mol, and this is the mass of one mole of the compound.