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The Earth's inner core weighs about 1.53E+22 kg.

CALCULATIONS:

The inner core is spherical with a diameter of about 1,250 km (780 miles).

-- Its volume (V = 4/3Ï€r3) is about 1 Billion km cubed (1,022,653,858 km3)

-- V = 4/3Ï€(1250/2)3

[Excel formula: =4/3*PI()*(1250/2)^3]

= 1.022x1018 m3

The estimated average density of the inner core is about 15,000 kg/m³.

-- Weight = volume x density

-- 1.022x1018 (m³) * 15,000 (kg) =

= 1.534x1022 kg

[Excel formula: =(4/3*PI()*(1250*1000/2)^3)*15000]

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