Answer: The molality of solution is 1.2 mole/kg
Explanation:
Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent.
where,
n = moles of solute
= weight of solvent in kg
Given : 10 g of glycerol is present in 100 g of solution
moles of glycerol =
mass of water (solvent )= (100-10) = 90 g = 0.09 kg
Now put all the given values in the formula of molality, we get
Therefore, the molality of solution is 1.2 mole/kg
Wha t kind of variables
independent variables
dependent variables
controled variables
Answer:
679.32 kJ
Explanation:
Heat required = number of moles * latent heat of fusion of water
So since we are given the mass of water and not the number of moles our first step is to calculate the number of moles of water available,
heat required = 111.0 mol * 6.12 kJ/mol
= 679.32 kJ
H= energy of product minus energy of reactant
H is endothermic and positive when heat is absorbed
H is exothermic and negative when heat is released
You forgot to attach the diagram but I have an idea of what it might look like. So since the energy of reactant is at a lower level and energy of product is at a higher level, the reaction will be positive.
Answer: C. The difference of the energy of the reactants and the energy of the products.
The correct answer is B. The atomic radius decreases across a period but increases down a group. The periodic table is arranged in order to predict certain properties of the elements across a period or down a group. Aside from the atomic radius, other trends include electron affinity, ionization energy, electronegativity and metallic character.