How many grams of nacl are required to make 500.0 ml of a 0.25 m nacl standard solution?

Because a model would make the investigation easier to understand

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.

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