Molarity = moles of solute/volume of solution
0.450 M = m/200ml
= 90 millimoles, or, what we need; 0.09 moles
0.09 moles NaOH (39.998 grams NaOH/1 mole NaOH)
= 3.60 grams of NaOH needed
2.24g Explanation: 0.200 M = 0.200 Moles/L Moles in 280 ml = 0.200 Moles/L * (1L/1000ml)*280ml = 0.056 moles 1 mole NaOH = 23g+16g+1g = 40g 0.056 moles *(40g/1mole) = 2.24g
2 mole because formula mass is 40 g so divide 40 by 40 you get one and then divide 1 by .50 you will get 2
The mass is 0,8 g.
We need 8 g NaOH.
8 grams
if u need help txt or call me at 714 270 0450
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