Answer:
The model was the result of hundreds of years of experiments. however we have had modifications.
Explanation:
Answer: D
Explanation:
I assume you meant .
- The atomic mass of potassium is 39.0983 g/mol.
- The atomic mass of sulfur is 32.065 g/mol.
- The atomic mass of oxygen is 15.9994 g/mol.
So, the formula mass of potassium sulfate is 2(39.0983)+32.065+4(15.9994)=174.2592 g/mol.
So, 5.00 moles have a mass of (5.00)(174.2592), which is about <u>870 g</u>
Answer: > .
Explanation:
Lattice enthalpy is defined as heat energy required to break 1 mole of crystal lattice. It is represented as .
Hydration enthalpy is defined as amount energy released when 1 mole of ions undergo hydration (surrounding of water molecules).It is always negative. It is represented as .
Enthalpy of solution = Lattice enthalpy + hydration enthalpy
If amplitude of lattice enthalpy > hydration enthalpy , enthalpy of solution will positive.Hence, solution will feel cool.
If magnitude Lattice enthalpy < hydration enthalpy, enthalpy of solution will negative. Hence solution will feel warm or hot.
Reaction between sodium hydroxide and water is an example of an exothermic reaction. During this process sodium hydroxide dissociates into sodium ions and hydroxide ions into the water.
Thus lattice enthalpy is lesser than the hydration enthalpy.
Answer:
False
Explanation:
The term was first "officially" used by French physicist Jean Baptiste Perrin. He technically referenced the works of Avogadro
Answer: The gravitational pull on Moon B is greater than on Moon A because Moon B is closer to the new planet than Moon A.
Explanation:
The gravitational force exerted by the two objects on each other is inversely proportional to the square of the distance between the objects.
F = gravitational force or pull
G = gravitational constant on that planet
M = mass of the object-1
m = mass of object-2(Mass of Moon-A or Moon-B)
r = distance between two objects
With decease in distance 'r' the force between the object increases or vice versa.So, from this we can say that the gravitational pull on Moon-B is more than the gravitational pull on Moon-A because the Moon B is closer than the Moon-A from the new planet.