An analytical procedure requires a solution of chloride ions. how many grams of cacl2 must be dissolved to make 2.15 l of 0.0520 m cl-? [atomic mass: ca=40.1 g/mol; cl=35.5 g/mol]

Mass of CaCl₂ that must be dissolved is around 6.22 g

Explanation:

Calcium chloride dissociates to form Ca²⁺ and Cl⁻ ions as shown below:

Therefore, 1 mole of CaCl₂ corresponds to 1 mole of Ca²⁺ and 2 moles of Cl⁻

From the given information:

Moles of Cl-  =

Based on the stoichiometry:

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.