7. When polarizing standard solutions of lead (II), the following results were obtained:
СPb*106, g/ml 0.50 1.00 1.50 2.00
h, mm 4.0 8.0 12.0 16.0

A weight of aluminum alloy, mass m (g), was dissolved, and the solution was diluted to 50.0 ml. The height of the polarographic wave of lead in the resulting solution turned out to be equal to hx. Calculate the mass fraction of lead in the sample w (%).

Option 7
m, g 5.134
h, mm 9.0

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