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20%
d=m/v
1,24=m/250
m=310
26=100ms/310
ms=80,6g KOH
56g KOH - 63g HNO3
80,6g KOH - x
x=90,675 HNO3
90,675 - 20%
x - 100%
x=453,375 ml HNO3