In the Eqn: [3 Fe + 2 O2 → Fe3O4], How many grams of Fe will be needed to react with 6.85 mol O2 ? SOMEONE GIVE ME A GOOD ANSWER NOW FAST PLEASE

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5