Question

Please answer ALL questions, not just 1. Specifically in need for 3-8.

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

7. what is the molecular formula of a compound that contains 39% C, 45% N, and 16% H if 0.157g of the compound occupies 125 mL with a pressure of 99.5 kPa at 22 degrees celsius?
8. An organic compound has a composition of 93.46% C and 6.54% H by mass. A solution of 0.090g of this compound in 1.10 g of camphor melts at 158.4 degrees celsius. The melting point of pure camphor is 178.4 degrees celsius. Kf for camphor is 37.7 degrees celsius/m. What is the molecular formula of the solute?

Answer 1