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(c)
反応したCaCO3と生じたCO2は同じ物質量(mol)
CO2 560mLは 560/22400=1/40 mol
反応したCaCO3は 100x1/40=2.50g
4.00g加えて2.50g反応したので 4.00-2.50=1.50g
かな？
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