Molarity and Molality Concentration

A chemist needs to prepare 3.00 L of a 0.250 M solution of potassium permanganate (KMnO₄). What mass of KMnO₄ does she need to make the solution?

What mass of CaCl₂ is needed to make 600. mL of a 0.380 M solution?

Calculate the molality of 15.00 M HCl with a density of 1.0745 g/cm³

What is the mass of a sample of a 0.449 molal KBr that contains 2.92 kg of water?

How many moles of sucrose are dissolved in 250 mL of solution if the solution concentration is 0.150 M?