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8,9g - 1 cm³
10g - x cm³
x = 10g • 1cm³/8,9g
x = 1,12 cm³
Żelazo:
7,9g - 1 cm³
90g - y cm³
y = 90g • 1cm³/7,9g
y = 11,39 cm³
czyli:
1,12cm³ + 11,39cm³ = 12,51cm³
100/12,51 = 7,99 g/cm³ ≈ 8g/cm³