Question

What is the molarity of a 5.00x10^2 mL solution containing 21.1 g of potassium bromide (KBr)? The molar mass of KBr is 119.0 g/mol.

Answer 1

\[a) 3.55 x 10^-4 M\]
\[b) 42.2M\]
c) 0.355 M\[d)8.87*10^{-2}\]

Answer 2

5*10^2 ml = 500 ml = 0.5 liter
convert 21.1 g of KBr to mol by dividing the mass by the molar mass

then calculate how many moles per liter you have.