Question

Part A Calculate the number of moles of aluminum, sulfur, and oxygen atoms in 4.00 moles of aluminum sulfate, Al2(SO4)3 Express the number of moles of Al, S, and O atoms numerically, separated by commas Hints moles of Al, S, O = moles Submit My Answers Give Up Part B Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 8.40 moles of magnesium perchlorate. Mg(CIO4) 2 . Express the number of moles of Mg, Cl, and O atoms numerically, separated by commas Hints moles of Mg, Cl, O- moles Submit My Answers Give Up Part C A sample of propane, C3 Hs, contains 12.3 moles of carbon atoms. How many total moles of atoms does the sample contain? Express the total number of moles of carbon and hydrogen numerically Hints moles Submit My Answers Give Up

Answer 1

Answer- Part A 1 mole of aluminium sulphate (Al, (So.),) contains 2 moles of aluminium (Al) 3 moles of sulphur (S) 12 moles of oxygen (0) So, 4 moles of aluminium sulphate (A1, (So,),) will contain 4 times the moles of each element present as shown below: 8 moles of aluminium (Al) 12 moles of sulphur (S) 48 moles of oxygen (O) Hence, the number of moles of AI, S, O are 8, 12, 48 moles. Part B 1 mole of magnesium perchlorate (Mg (C1o,), ) contains 1 mole of magnesium (Mg) 2 moles of chlorine (CI) 8 moles of oxygen (0) So, 8.40 moles of magnesium perchlorate (Mg (C10,),) will contain 8.40 times the moles of each element present as shown below: 8.40 moles of magnesium (Mg) 16.80 moles of chlorine (CI) 67.20 moles of oxygen (0) Hence, the number of moles of Mg, Cl, O are 8.40, 16.80, 67.20 moles. Part C 1 mole of propane (C,H, ) contains 3 moles of carbon (C) 8 moles of hydrogen (H) If the number of moles of carbon atoms are 12.3, then the number of moles of hydrogen will be 8 moles of hydrogen (12.3 moles of carbon) = 32.8 moles of hydrogen %3D 3 moles of carbon Hence, the total number of moles of carbon and hydrogen are =12.3 moles of carbon +32.8 moles of hydrogen 45.1 moles