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15.6 grams of lead(II) nitrate is in a test tube. A 4.8-g sample of potassium iodide is an Erlenmeyer flask. The substance in the test tube is poured into the Erlenmeyer flask so that the two substances react. The mass of the Erlenmeyer flask 115.6 grams. What is the mass of the combined products & Erlenmeyer flask?

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Answer:

 Mass of combined products = 20.4 grams

 Mass of combined product and Erlenmeyer flask = 136 grams

Explanation:

  By law of mass conservation, mass cannot be destroyed or created. So mass before reaction is mass after reaction.

  Mass of  lead(II) nitrate  = 15.6 grams

  Mass of potassium iodide = 4.8 grams

  Mass of the Erlenmeyer flask = 115.6 grams

  Mass of reactants = 15.6 + 4.8 = 20.4 grams

  So mass of products = 20.4 grams

  Mass of combined product and Erlenmeyer flask = 115.6 + 20.4 = 136 grams

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