Prepare 250 cm3 2M NAOH: molar mass M = 40g/mol. calculate substance mass

The mass of the substance is 20 g

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

where,

n = moles of solute

= volume of solution in ml  = 250 ml  

moles of =

Now put all the given values in the formula of molality, we get

Therefore, the mass of the substance is 20 g

the correct answer is c.stops after infancy and childhood.

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