Answer:
The value of 
for xylene is 4.309°C/m.
The molar mass of pentane using this data is 73.82 g/mol.
Explanation:
where,
=depression in freezing point
= freezing point constant
we have :
1) freezing point constant for xylene = =?
Mass of toluene = 0.193 g
Mass of xylene = 2.532 kg = 0.002532 kg ( 1 g =0.001 kg)
The value of for xylene is 4.309°C/m.
2)
Mass of pentane = 0.123 g
molar mass of pentame= M
Mass of xylene = 2.493 g = 0.002493 kg
Freezing point Constant of xylene =
M = 73.82 g/mol
The molar mass of pentane using this data is 73.82 g/mol.
Like terms in algebra are terms that have the same variables and power. Constants contain only numbers, we call them constants because their values don't change. Coefficients are the numbers in front of the variable ex: 5y in that expression 5 is the coefficient. So in the expression 2+3a+9a there is one constant which is 2 the likes terms are 3a and 9a because they have the same variable. And the coefficients are 3 and 9 because they are in front of the variable.
Answer : Option A) The lattice energy increases as cations get smaller, as shown by LiF and KF.
Explanation : It is observed that lattice energy is mostly influenced by two main factors of an ionic solid which are;
i) The charge on the ions - As the charge of the ions increases, the lattice energy is observed to increase too.
and
ii) The radius, or size, of the ions - As the size of the ions increases, the lattice energy decreases with it.
So, here in this question the second reason is clearly observed. Hence, it is self-explained that the size of the cations are decreased in the ionic solids the lattice energy increases.
Answer:
Blue Jay is the correct answer.
Explanation:
