Answer: 3 Molecular weight of NaOH= 40 gm Dissolved amount of NaOH=80 gm No of moles= weight of NaOH/Mlecular wt. of NaOH = 80/40=2 Volume of water= 500ml=0.5 litres Molarity= no. of moles of NaOH/Volume of water= 2/0.5=4M
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