What is the amount

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Problem

What is the amount, in moles, of sulfate ions in 100 cm3100\text{ cm}^3 of 0.020 mol dm−30.020\text{ mol dm}^{-3} FeSO4(aq)\mathrm{FeSO_4(aq)}? (1) 2.0×10−32.0\times10^{-3} (2) 2.0×10−22.0\times10^{-2} (3) 2.0×10−12.0\times10^{-1} (4) 2.02.0

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