Answer:
6.18 g
Explanation:
We know we will need a balanced equation with masses, moles, and molar masses, so let’s gather all the information in one place.
: 41.99
Na₂SiO₃ + 8HF ⟶ 2NaF + H₂SiF₆ + 3H₂O
<em>n</em>/mol: 0.58
1. Use the molar ratio of NaF:HF to calculate the moles of NaF.
2. Use the molar mass of NaF to calculate the mass of NaF.
Answer:
The correct approach is "-2.67 kJ/mole". A further solution is described below.
Explanation:
The given values are:
No. of moles,
= 5.60 mol
Substance releases,
ΔH = 14.9 kJ
Now,
The ΔH in terms of kJ/mol will be:
= 
On putting the given values of ΔH, we get
= 
= 
12)
Answer: an endothermic reaction is where there is absorption of energy during the reaction. The energy of reactants is less than the energy of products.
As the enthalpy of the reaction is the difference in the total enthalpy of formation of products and total energy of formation of reactants and in endothermic reaction enthalpy is positive.
thus the energy of products is more than the energy of reactants.
The true statement is :The overall enthalpy of the system increases during the change.
Question 13
If the volume is lowered to one fourth it will increase the concentration (moles/volume). Thus, It will increase because the concentration of the reactants increases.
Question 14
As the value of equilibrium constant is in multiple of thousand, the reaction will be more favourable in forward direction hence
Ans: The equilibrium reaction mixture will have a very high concentration of products.
Question 15
As the system is in equilibrium and by decreasing the concentration of reactant we are disturbing the equilibrium state. In order to maintain the equlibrium the system will move in backward direction and hence
The rate of reverse reaction increases.
Answer:
Explanation:
Aqueous solution of copper sulphate
is acidic in nature, as when copper sulphate on dissolving with water, following chemical reaction takes place :
CuSO4 + 2 H2O ====> Cu(OH)2 + H2 SO4
As we can see, copper hydroxide and sulphuric acid is generated in this chemical reaction.Copper hydroxide is a weak base whereas sulphuric acid is a very strong acid which results into increase in acidity of the solution.
Thus, the aqueous solution of copper sulphate is acidic in nature.
