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1. Iron reacts with oxygen gas to give iron(iii) oxide, Fe2O3 a.) Write a balanced equation for the reaction b.) If 2.68 g pf Fe reacts with excess oxygen gas, what mass of Fe2O3 will be produced? c.) What mass of O2 is required for the reaction? 2. Aluminum chloride, AlCl3, is an...

1. There are 20.3 g of (198 superscript)Au left after 13.5 days. If the half-life is 2.10 days, how many grams were in the original sample? 2. Calculate the atomic mass for the element Iron if there are two isotopes: (55 superscript)Fe, with a mass of 54.974 and 15% abundance. (56 superscript)Fe...