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For the hydrate sodium sulfate decahydrate, calculate the following:  (a) the percent of sodium (by mass) in the hydrate (14.3%) (b) percent of TOTAL oxygen (by mass) in the hydrated compound. (69.6%) (c) Percent of water (by mass) in the hydrate (55.9%) 4. Calculate the percentage of nitrogen (by mass) in the ammonium nitride (82.4%) Moles Worksheet How many moles are there in 768 grams of iron (III) sulfate?(1.92 mol) How many moles are there in 1.2 kg of potassium dichromate?(4.1 mol) You have 13.2 moles of lead (II) nitrate. How many grams is this? (4.37 x 103 g) How many pounds would 5.75 moles of magnesium hydroxide weigh?(0.739 lb) How many moles are there in 78 grams of nitrogen gas?(2.8 mol) EMPIRICAL FORMULA WORKSHEET What is the empirical formula for a compound which contains 0.0134 g of iron, 0.00769 g of sulfur and 0.0115 g of oxygen? (FeSO3) Find the empirical formula for a compound which contains 32.8% chromium and 67.2% chlorine. 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