False anything that has mass takes up the space
1).C-by analyzing its interactions with another particle
2).C-18
3).C-energy sub-level
Answer : The molal freezing point depression constant of liquid X is, 
Explanation : Given,
Mass of urea (solute) = 5.90 g
Mass of liquid X (solvent) = 450 g = 0.450 kg
Molar mass of urea = 60 g/mole
Formula used :

where,
= change in freezing point
= freezing point of solution = 
= freezing point of liquid X = 
i = Van't Hoff factor = 1 (for non-electrolyte)
= Molal-freezing-point-depression constant = ?
m = molality
Now put all the given values in this formula, we get


Therefore, the molal freezing point depression constant of liquid X is, 
Answer:
We know that there are two types of forces ,one is cohesive force between same molecule and other one is adhesive force between two different type of molecule.
In the water cohesive is more dominate than the adhesive force that is why it is for water molecule bond together.Another reason is that the hydrogen molecule have low electro negativity than the oxygen molecule that is oxygen molecule try to pull hydrogen and form the hydrogen bond.
Answer:
Empirical formula is Fe₂O₃.
Explanation:
Empirical formula:
It is the simplest formula gives the ratio of atoms of different elements in small whole number.
Given data:
Mass of iron = 4.166 g
Mass of oxygen = 1.803 g
Empirical formula = ?
Solution:
Number of gram atoms of Fe = 4.166 / 55.845 = 0.075
Number of gram atoms of O = 1.803 / 15.999 = 0.113
Atomic ratio:
Fe : O
0.075/0.075 : 0.113/0.075
1 : 1.5
Fe : O = 1 : 1.5
Fe : O = 2(1 : 1.5)
Empirical formula is Fe₂O₃.