Final answer:
There are 0.045 moles of NaOH in 25 mL of a 1.8 M solution. The calculation involves converting the volume to liters and then multiplying by the molarity.
Step-by-step explanation:
The question asks how many moles of NaOH are in 25 mL of a 1.8 M solution. To find the number of moles, we use the definition of molarity, which is moles of solute per liters of solution. First, we need to convert the volume from milliliters to liters by dividing by 1000 (25 mL / 1000 = 0.025 L). The calculation is then straightforward:
Number of moles of NaOH = Volume (L) × Molarity (M)
Number of moles of NaOH = 0.025 L × 1.8 M = 0.045 moles of NaOH