Answer
(a) 1.8 moles
(b) 0.38 moles
(c) 0.2376 moles
Work Step by Step
Molarity = (weight/molecular weight)(1000/V in mL)
Molarity = Number of moles / Volume in L
Number of moles = Molarity x Volume in L
(a) 1.5 L of a 1.2 M NaCl solution
Number of moles = 1.2 X 1.5
= 1.8 moles
(b) 0.448 L of a 0.85 M NaCl solution
Number of moles = 0.448 X 0.85
= 0.38 moles
(c) 144 mL of a 1.65 M NaCl solution
Number of moles = 1.65 X 0.144
= 0.2376 moles