Câu 1: Tính số mol nguyên tử có trong 9.1023 nguyên tử oxi? A. 1 mol B. 5 mol C. 1,2 mol D. 1,5mol Câu 2: Tính số mol nguyên tử có trong 15.1023 nguyên tử sắt? A. 2 mol B. 2,5 mol C. 1,2 mol D. 1,5mol Câu 3: Tính số mol phân tử có trong 50 gam CaCO3 ? A. 1mol B. 0,5mol C. 1,2 mol D. 1,5mol

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