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1. Determine the formula weight for each compound: sulfur tetrafluoride, carbon dioxide, sodium chloride, phosphorus pentafluoride,...

1. Determine the formula weight for each compound: sulfur tetrafluoride, carbon dioxide, sodium chloride, phosphorus pentafluoride, calcium phosphate, water, propane (C3H8), iron(III) sulfate. Which compounds would also have a molecular weight or molar mass? What is the difference between a formula weight and a molecular weight?
2. Determine the percent composition for each compound in question 1. Is it possible for two compounds to have the same percent composition?
3. For each compound in question 1, determine the number of moles of the compound that would be in 10.0g of that compound? How many molecules? How many atoms?
4. For each compound in question 1, what mass of the compound would 0.75 moles of the compound be?
5. For each compound in question 1, what mass of the compound would be 5.47 x 10^12 formula units be?
6. Determine the percent of water in copper (II) sulfate pentahydrate to three significant figures


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Answer #1

Ans 1 :

The formula weight of the compounds can be determined by adding the atomic weights of all the elements present in the compound , each multiplied by their number of atoms present.

So here :

sulfur tetrachloride : 108.07 amu

carbon dioxide : 44.01 amu

sodium chloride : 58.44 amu

phosphorus pentafluoride : 125.97 amu

calcium phosphate : 270.1 amu

water : 18.015 amu

propane : 44.1 amu

iron (III) sulfate : 399.9 amu

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