CHEM 370 Week 1 Homework

  1. How many significant figures are in each of the following values?

    1. 903

    2. 0.903

    3. 1.0903

    4. 0.0903

    5. 0.09030

    6. \(9.03 \times 10^2\)

  2. Report results for the following calculations to the correct number of significant figures.

    1. 4.591 + 0.2309 + 67.1

    2. 313 - 273.15

    3. 1.712 × 8.6

    4. (8.314 × 298) / 96485

    5. \(\log(6.53 \times 10^{-5})\)

    6. \(10^{-7.14}\)

    7. \((6.51 \times 10^{-5} ) \times (8.14 \times 10^{-9})\)

  3. You have a 10-mL graduated cylinder containing water, with the meniscus at the 5.2 mL mark. What value, including significant digits, do you record in your notebook? The cylinder is marked every 0.2 mL.

  4. If you have 7.68 mM aqueous solution of copper, what is the concentration of copper in mg/L?

  5. Express this value in parts per million (ppm).

  6. An analyst wishes to add 256 mg of \(\ce{Cl^-}\) to a reaction mixture. How many mL of 0.229 M \(\ce{BaCl2}\) should they add?