<u>Answer:</u>
211.9 J
<u>Explanation:</u>
The molecules of water release heat during the transition of water vapor to liquid water, but the temperature of the water does not change with it.
The amount of heat released can be represented by the formula:
where = heat energy,
= mass of water and
= latent heat of evaporation.
The latent heat of evaporation for water is and the mass of the water is
.
The amount of heat released in this process is:
211.9 J
<u>Answer:</u> The correct answer is Option B.
<u>Explanation:</u>
To calculate the molarity of solution, we use the equation:
.......(1)
Molarity of calcium phosphate solution = 0.100 M
Volume of solution = 2.00 L
Putting values in equation 1, we get:
Moles of calcium phosphate = 0.200 moles
1 mole of calcium phosphate contains 3 moles of calcium atoms, 2 moles of phosphate atoms and 8 moles of oxygen atoms.
So, 0.200 moles of calcium phosphate will contain = moles of oxygen atoms.
Moles of oxygen atoms = 1.6 moles
Molarity of calcium phosphate solution = 0.100 M
Volume of solution = 1.00 L
Putting values in equation 1, we get:
Moles of calcium ions = moles
Molarity of calcium phosphate solution = 0.100 M
Volume of solution = 5.00 L
Putting values in equation 1, we get:
Moles of phosphorus atoms = moles
According to mole concept:
1 mole of a compound contains number of atoms
Number of phosphorus atoms in 0.500 moles of calcium phosphate will be =
1 mole of calcium phosphate contains 3 moles of calcium ions and 2 moles of phosphate ions.
So, 0.200 moles of calcium phosphate will contain = moles of calcium ions
Moles of calcium ions = 0.600 moles
Hence, the correct answer is Option B.