a solution was made by dissolving 8.2g of calcium nitrate to give 2 litres os solution. determine the concentration of nitrate ions in moles per litre

Sure, here are the steps to determine the concentration of nitrate ions in moles per litre:

1. First, we need to calculate the molar mass of calcium nitrate (Ca(NO3)2). The molar mass of calcium (Ca) is approximately 40.08 g/mol, nitrogen (N) is approximately 14.01 g/mol, and oxygen (O) is approximately 16.00 g/mol. Since there are two nitrogen atoms and six oxygen atoms in calcium nitrate, the molar mass of calcium nitrate is 40.08 g/mol + 2(14.01 g/mol) + 6(16.00 g/mol) = 164.10 g/mol.

2. Next, we calculate the number of moles of calcium nitrate in the 8.2g of the substance. The number of moles is given by the mass of the substance divided by its molar mass. So, the number of moles of calcium nitrate is 8.2g / 164.10 g/mol = 0.05 mol.

3. Since each unit of Ca(NO3)2 yields two nitrate ions (NO3-), the number of moles of nitrate ions is 2 * 0.05 mol = 0.1 mol.

4. Finally, we calculate the concentration of nitrate ions in the solution. The concentration is given by the number of moles of the substance divided by the volume of the solution in litres. So, the concentration of nitrate ions is 0.1 mol / 2 L = 0.05 mol/L.