What mass of KBr (in grams) should you use to make 150.0 mL of a 1.70 M solution of KBr?

V = 150.0 mL = 0.15 L

c = 1.70 M

m=?

For the purpose, the equation for molar concentration is necessary:

c=n/V

From the equation we can determine the number of moles:

n = cxV = 1.70M x 0.15L = 0.255 mole

Now we can calculate the mass:

m = nxM = 0.255 x 119 = 30.34 g is necessary