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You'll never reach that because 98% H2SO4 is of lower normality: max. 37 N

Density 1840 g solution / L solution

Molar mass 98 g/mol H2SO4

concentration 980 gH2SO4 / 1000g solution

H2SO4 2 equivalent H+/mol H2SO4

All together making:

[1840*(980/1000) / 98 ] * 2 = 36.8N H2SO4

Or the other way 'round:

80N = 40M = 40*98(g/mol) = 3920 gH2SO4/L = 3920/(98*100) = 4000 g (solution)/L , which is more than the most concentrated H2SO4 solution can weight

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Q: How do you make 80N H2SO4 solution from 98 percent acid?
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