Why is when that alcohol and water mixed together the total volume is lesser?

What is the percent by volume of alcohol if 142 mL is mixed with water to form 167 ml of solution?

  • Answer:

    Ethanol-water mixtures have less volume than the sum of their individual components at the given fractions. Mixing equal volumes of ethanol and water results in only 1.92 volumes of mixture. Alcohol by volume would be 65% if you mixed 142 mL. of alcohol water (25 mL) to form 167 mL of solution.

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