To solve this, we apply the definition of Molarity provided in the text: Molarity (M) = Moles of solute / Volume of solution in litres. For part (a), we calculate the moles by dividing the given mass by the molar mass. For part (b), we first calculate the moles in the initial volume and then divide by the final diluted volume to find the new molarity, adhering to the method shown in Example 1.2.