We need moles of Ca(OH)_2
- Molarity=Moles/Volume in L
- 0.025=Moles/1.5
- Moles=1.5(0.025)
- Moles=0.0375mol
Molar mass of Ca(OH)_2=74g/mol
Now
- Mass=Molar mass×Moles
- Mass=0.0375×74
- Mass=2.77g
Option C
<span>In the given example,
it led Sam’s theory to produce a hypothesis. It is because the educated guess
that he has made has been linked to the theory where in the theory is about
happiness and production that led him to think that having happy employees will
make more products to be produced.</span>
Answer:
B. Lower than 100 °C because hydrogen sulfide has dipole-dipole interactions instead of hydrogen bonding.
Explanation:
Intermolecular bonds exists between seperate molecules or units. Their relative strength determines many physical properties of substances like state of matter, solubility of water, boiling point, volatility, viscosity etc. Examples are Van der waals forces, hydrogen bonds and crystal lattice forces.
In hydrogen sulfide, the intermolecular bond is a dipole-dipole attraction which is a type of van der waals attraction. It occurs as an attraction between polar molecules. These molecules line such that the positive pole of one molecule attracts the negative pole of another.
In water, the intermolecular bond is hydrogen bonds in which an electrostatic attraction exists between the hydrogen atom of one molecule and the electronegative atom of a neighbouring molecule.
Based on their relative strength:
Van der Waals forces < Hydrogen bonding forces < crystal lattice
This makes water boil at a higher temperature than hydrogen sulfide.
It applies to both physical and chemical changes.
