<span>Copper (I) Selenide by the stock system or Cuprous Selenide by the Latin system.</span>
Answer : The molar concentration of ethanol in the undiluted cognac is 8.44 M
Explanation :
Using neutralization law,
where,
= molar concentration of undiluted cognac = ?
= molar concentration of diluted cognac = 0.0844 M
= volume of undiluted cognac = 5.00 mL = 0.005 L
= volume of diluted cognac = 0.500 L
Now put all the given values in the above law, we get molar concentration of ethanol in the undiluted cognac.
Therefore, the molar concentration of ethanol in the undiluted cognac is 8.44 M
When a lid is placed on a pot of boiling water, water drops form all over the lid's inner surface. The vapors of water that are formed up on boiling escape in to the surroundings when there is no lid on the pot. When the pot is covered with a lid the gaseous water molecules condense on the cooler inner surface of the lid to form liquid water droplets. So, the best statement that describes the change in water vapor molecules as they change to liquid, a phenomenon called condensation, is that the change here is a physical change.