chemistry

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the molarity of 2% by weight of aqueous solution of H2S4(molecular weight = 98)

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2% w/w means 2g H2SO4/100 g soln or 20g/1000g solution.
20g is how many mols? That's 20/molar mass = ?
M = mols/L solution. You don't know the volume of the solution. You need the density to determine that.
volume = mass/density converted to L. Then M = mols/L will give it to you

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