Chem. 213 –Review 1 WINONA STATE UNIVERSITY Fall 2005

Dr. Myoung Eun Lee

Name ______

Instructions: Follow rules of sig. figs. A counted or defined number has an infinite number of significant figures. Show your work for full credits. Box final answer(s) with appropriate unit(s).

1. Give the name or formula for the following compounds.

  1. Sodium sulfate Answer ______
  1. Calcium chloride Answer ______
  1. NO2 Answer ______
  1. MgCO3 Answer ______
  1. Barium nitrate Answer ______
  1. Phosphorus pentafluoride Answer ______
  1. Magnesium phosphate Answer ______

2.  Perform the following calculation and show the number of significant figures in your answer. Show your work.

a. 43.87 g – 21.6 g = ______Number of Sig. Figs.______

b. 11.2 cm x 6.3429 cm = ______Number of Sig. Figs.______

3.  How many moles of CaCl2 are in a 10.0 g-sample of CaCl2? The molar mass of CaCl2 is 110.98 g/mole. Show your work.