How many moles are there in 23.4g naoh?

2.34 M

Explanation:

The molecular weight of sodium hydroxide is 39.997 g/mol.That is, 1 mole weights 39.997 g

You have

23.4 g so you have

23.4g /39.997 g/mol=0.585 moles

These 0.585 moles are present in 250 ml and 250 ml is equivalent to 0.25 liters.

Molarity is moles per liter.

molarity=moles/litre

molarity=0.585 moles/0.25 L

molarity =2.34 M

the answer is c i believe