Molarity of solution is given as,
Molarity = Moles / Volume of Solution ---- (1)
As we are given with mass, so we will expand moles as,
Molarity = (Mass / M.Mass) / Volume of Solution
Or,
Molarity = Mass ÷ (M.mass × Volume of Solution) -- (2)
SO,
Molarity = Unknow
Mass = 58.4 g
M.Mass = 58.4 g.mol⁻¹
Volume = As it is missing in statement, so we will assume it 1 L
Putting values in eq.
Molarity = 58.4 g ÷ (58.4 g.mol⁻¹ × 1 L)
Molarity = 1 mol.L⁻¹