Calculate how much energy will be released when 11.11g of calcium chloride are dissolved in 100ml of solution
how would i express the following answer in eV and to an appropriate number of significant figures?
E=-(k/n2)
n = principle quantum number k = 1.312 x 103 kJmol-1
how would you solve this problem using concepts of enthalpy
For volunteers, the original question has not yet been answered.
To calculate the amount of energy released when a substance is dissolved, we need to know the enthalpy change of the dissolution process, which is usually given as the enthalpy of solution (ΔHsoln). The enthalpy of solution is the amount of energy absorbed or released when one mole of a substance dissolves in a specific amount of solvent, usually water.
Given that we have the mass of calcium chloride (CaCl2) and the volume of the solution, we need to convert these quantities into the number of moles.
First, let's convert the mass of calcium chloride to moles by using its molar mass. The molar mass of calcium chloride (CaCl2) is calculated by adding up the atomic masses of its constituent elements from the periodic table:
Ca: atomic mass = 40.08 g/mol
Cl: atomic mass = 35.45 g/mol (chlorine is diatomic Cl2, but we are dealing with CaCl2, so we consider it as one Cl atom)
Molar mass of CaCl2 = (1 × 40.08 g/mol) + (2 × 35.45 g/mol) = 110.98 g/mol
Next, we calculate the number of moles of calcium chloride:
moles of CaCl2 = mass / molar mass
= 11.11 g / 110.98 g/mol
≈ 0.100 moles (rounded to three decimal places)
Now, let's calculate the energy released during the dissolution process using the given volume of the solution.
Unfortunately, the enthalpy of solution for calcium chloride is not provided. However, if it were provided, we could use the equation:
Energy released = moles of solute × enthalpy of solution
Without the enthalpy of solution, it is not possible to directly calculate the amount of energy released.
To find the enthalpy of solution, you can look it up in a reliable reference book or search for it in reputable online databases. Alternatively, it can be determined experimentally using calorimetry, which measures the heat energy changes during a reaction.
So, in this case, we cannot accurately determine how much energy will be released when 11.11 g of calcium chloride are dissolved in 100 mL of solution without knowing the enthalpy of solution value.