7. Calculate each of the following quantities: moles of Compound in 15.8 g of Fe

Question

7. Calculate each of the following quantities: moles of Compound in 15.8 g of Fet(CIO) A. 97 mol B. 0.0446 mol C. 1.74 x 104 mol D. 0.9507 mol 8. Potassium nitrate decomposes on heating, producing 4 KNO3 ? 2KO + 2N2 To produce 88.6 kg of oxygen, how many.. .grams of KNO, must be heated? potassium oxide and gaseous nitrogen and oxygen: A. 22.4 g B. 2.22 x 10' g C. 2.24 x 10 g D. 150 g 9. Chromium (II) oxide reacts with hydrogen sulfide gas to form chromium (III) sulfide and water: To produce 421 g of CrS... how many grams of Cr,0, are required? D. 22.4 g A. 320 g B. 150 g C. 5.89 g 10. Many metals react with oxygen gas to form the metal oxide. For example, calcium reacts as follows: 2 Cao 2 Ca + O You wish to calculate the mass of calcium oxide that can be prepared from 4 and 2.80 g of O2. How many grams of CaO can be produced? B. 0.175 g C. 40.0 g D. 5.89 g A. 0.105 g

Explanation / Answer

7) 15.8 g of Fe(ClO4)3
   molecular mass of Fe(ClO4)3 = 1*55.84 + 3 * 35.45 + 12 * 16 = 354.19 g/mol
no of moles present = 15.8 g / 354.19 g/mol = 0.0446 mol

Option B is the right answer

**answering only first question due to policy and time constraints.

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