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Percents
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1.   Sydney performed an analysis on some water from Bigtown Lake. She tested four samples and found the lead concentrations to be in parts per million (micrograms per milliliter or mg per liter) to be 0.024, 1.027, 0.007, and 0.009 respectively. What was the average mass of lead? Round your answer to the nearest thousandth.

2.   A sample of ore is found to be 0.004% gold and 0.06% silver. What is the percent of matter in the ore that is neither gold nor silver?

3.   Eric and Destiny were working as partners on a chemistry experiment. They had just synthesized a white crystalline compound that precipitated to the bottom of the beaker. They weighed the compound (after drying it) and found they had 6.23 grams. According to their instructor the maximum yield for the experiment was 8.28 grams. What percent of the maximum did they achieve? Round your answer to the nearest hundredth of a percent.

4.   What is the concentration (in %) of a solution of 850 ml of water that has 9 grams of barium chloride dissolved in it? Round your answer to the nearest hundredth of a percent if needed.

5.   * This is a pre-made sheet.
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6.   Julia is concentrating a sample by distillation. She started with 110 ml of a solution that was about 0.04% inorganic salts. After several hours of distillation the amount of inorganics salts hasn't changed, but the volume had been decreased to 37 ml. What percent of the solution after distillation is inorganic salts? Round your answer to the nearest hundredth of a percent.


 


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