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Percents
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1.	What is the concentration (in %) of a solution of 850 ml of water that has 8 grams of barium chloride dissolved in it? Round your answer to the nearest hundredth of a percent if needed.

2.	A cold saturated solution of magnesium ferrocyanide contains 33 grams of the salt per 100 ml. If you have a solution that contains 12 g of magnesium ferrocyanide per 200 ml, how close is it to being saturated? Express your answer as a percent rounded to the nearest whole number.

3.	A sample of clay is found in Mongolia that contains aluminum, silicon, hydrogen, magnesium, iron, and oxygen. The amount of iron is equal to the amount of aluminum. If the clay is 20% silicon, 16% hydrogen, 8% magnesium and 24% oxygen, what is the percent iron?

Grace performed an analysis on some water from Bigtown Lake. She tested five samples and found the lead concentrations to be in parts per million (micrograms per milliliter or mg per liter) to be 1.03, 1.01, 1.032, 1.014, and 1.007 respectively. What was the average mass of lead? Round your answer to the nearest thousandth.

Victoria is concentrating a sample by distillation. She started with 90 ml of a solution that was about 0.14% inorganic salts. After several hours of distillation the amount of inorganics salts hasn't changed, but the volume had been decreased to 47 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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