Answer to Question #185152 in General Chemistry for hayley samantha farah

Question

Assume the given amount of RbF fully dissociates in water. Calculate the molarity of a solution if 138.42 g of RbF are dissolved into a solution of water that has a final volume of 2.00 L.

Answer 1

Molar mass of RbF = 104.47 g/mol

Mass of RbF = 138.42g

number of moles = 138.42/104.47 = 1.32 moles

Volume = 2.00 L

molarity = number of moles/ Volume = $\dfrac{1.32}{2.00}$ = 0.66 mol/L = 0.66 M