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QUESTION 2. (Start on a new page.) Methane gas, CH4, of mass 34,5 g is reacted with oxygen gas in a sealed container according to the following balanced chemical equation.

Chemistry

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  1. Identify the nature of the dissolution process.

    The problem states that the solubility of calcium nitrate is "highly endothermic."

  2. Understand the meaning of an endothermic process.

    An endothermic process absorbs heat from its surroundings. In this case, the dissolution of Ca(NO₃)₂ absorbs heat from the water (the solvent).

  3. Determine the effect on the solution's temperature.

    Since heat is absorbed from the solution, the temperature of the solution will decrease.

    The temperature of the final solution will DECREASE.
    Explanation: An endothermic process absorbs heat from the surroundings. When calcium nitrate dissolves, it takes heat from the water, causing the temperature of the solution to drop.

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