What mass of naoh is required to prepare 2.5dm of 1.5m naoh solution

The mass of NaOH that is required is 150 g

Explanation:

We calculate the weight of 1 mol of NaOH

Weight Na =23g/mol, Weight H= 1g/mol, Weight 0= 16g/mol

Weight NaOH =( 23+1 + 16) g/mol = 40 g/mol

1 dm3 (1000ml or 1 liter)---1 ,5 mol

2,5 dm3x= (2,5dm3x 1,5mol)/ 1 dm3= 3, 75 mol

1mol NaOH40 g

3, 75mol NaOH--x= (3, 75mol NaOHx40g)/1 mol NaOH= 150g

gravity causes stares to cluster i think so