General Chemistry 1

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  1. A typical aspirin, C\(_9\)H\(_8\)O\(_4\) , tablet contains 0.36 g. How many molecules are present?

  2. A sample of 45.8 g of MgSO\(_4\) \(\cdot\) 4 H\(_2\)O contains how many moles of MgSO\(_4\) \(\cdot\) 4 H\(_2\)O ?

  3. How many moles of sodium ions, Na\(^{+}\), are there in 5.63 g of Na\(_2\)SO\(_4\) ? (molar mass of Na\(_2\)SO\(_4\) = 124.04 g/mol)

  4. How many grams of silver are in 0.263 mol of Ag??

  5. How many moles of nitrogen atoms are in 15.0 g of N\(_2\)O\(_5\) (calculate with molar mass of N\(_2\)O\(_5\) = 108.010 g/mol) ?

  6. One of the compounds of iron and oxygen occurs naturally in the mineral magnetite. When a 2.447 g sample was analyzed it was found to have 1.771 g of Fe. Calculate the empirical formula of this compound.

  7. A white powder used in paints, enamels and ceramics has the following percentage composition: Ba (69.6%), C (6.09%), and O (24.3%). What is the empirical formula?

  8. Given a molar mass of 116.24 g/mol and an empirical formula of C\(_3\)H\(_8\)N, find the molecular formula for this compound.

  9. Calculate the mass percentages of the elements in CO\(_2\)

  10. A sample of a liquid with a mass of 8.657 g was decomposed into its elements and gave 5.217 g of C, 0.9620 g of H and 2.478 g of O. What is the percentage composition of each element in this compound?

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