Answer:
= 8350 joules
Solution and explanation:
- The heat of fusion refers to the quantity of heat released when a given amount of water freezes.
- For example, 1 g of water releases 334 J when it freezes at 0°C.
Therefore; For 25.0 g of water.
Heat released = Mass of water × heat of fusion
= 25 g × 334 J/g
= 8350 Joules
Hence, the amount of heat released when 25.0 g of water freezes at 0°C is 8350 J.
Answer:
Name ; Nickel(ii)Hydroxide
Formula;NI3O6
Explanation:
Answer:
The molarity of ethanol is 5.8*10⁻³ M.
Explanation:
Molar concentration is a measure of the concentration of a solute in a solution, be it some molecular, ionic or atomic species.
Molarity or Molar Concentration is the number of moles of solute that are dissolved in a certain volume. It is calculated by dividing the moles of the solute by the volume of the solution:
![Molarity=\frac{number of moles of solute}{volume}](https://tex.z-dn.net/?f=Molarity%3D%5Cfrac%7Bnumber%20of%20moles%20of%20solute%7D%7Bvolume%7D)
Molarity is expressed in units
.
Being the molar mass of ethanol 46
, then the number of moles that 40 grams of ethanol contain is calculated by:
![40 grams*\frac{1 mol}{46 grams} =0.87 moles](https://tex.z-dn.net/?f=40%20grams%2A%5Cfrac%7B1%20mol%7D%7B46%20grams%7D%20%3D0.87%20moles)
So, being:
- number of moles of solute= 0.87 moles
- volume 150 L
Replacing in the definition of molarity:
![Molarity=\frac{0.87 moles}{150 L}](https://tex.z-dn.net/?f=Molarity%3D%5Cfrac%7B0.87%20moles%7D%7B150%20L%7D)
Solving:
Molarity= 5.8*10⁻³ M
<u><em>The molarity of ethanol is 5.8*10⁻³ M.</em></u>