Answer:
5.15 moles
Explanation:
2zn + o2 = 2zno
5.15 2.57 5.15 moles
nzno=500/(16x2+65)= 5.15 moles
-> nzn = 5.15 x 2 ÷ 2 = 5.15 moles
 
        
             
        
        
        
Answer:
I think its a double reaction
Explanation:
 
        
             
        
        
        
Answer:
1 and 2
Trigonal planar
Tetrahedral
Trigonal Planar
Linear
Bent ( v- shape)
Explanation:
The highlighted atoms has a delocalized lone pair - 1 and 2
All sp2-hybridized carbon atoms have geometry- Trigonal planar
 All sp3-hybridized carbon atoms have geometry - Tetrahedral
 The nitrogen atom has geometry - Trigonal Planar
 The oxygen atom of the C=O bond has geometry - Linear
and the other oxygen atom has geometry - Bent ( v- shape)
P.S - The correct question is -
 
        
             
        
        
        
Answer : The total mass of oxygen gas released in the reaction will be, 12.8 grams
Explanation :
Law of conservation of mass : It states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
This also means that total mass on the reactant side must be equal to the total mass on the product side.
The balanced chemical reaction will be,

According to the law of conservation of mass,
Total mass of reactant side = Total mass of product side
Total mass of  = Total mass of
 = Total mass of 
or,
Total mass of  = Mass of
 = Mass of  + Mass of
  + Mass of 
As we are given :
Total mass of  = 16.12 grams
 = 16.12 grams
The mass of  = 9.72 grams
 = 9.72 grams
So,
Total mass of  = Mass of
 = Mass of  + Mass of
  + Mass of 


Therefore, the total mass of oxygen gas released in the reaction will be, 12.8 grams
 
        
             
        
        
        
Answer:

Explanation:
First, we find in the tables the ΔH of formation of each compound. As you can see in the (image 1)
Then we solve the ecuation for ΔH°reaction
ΔH°reaction=∑ΔH°f(products)−∑ΔH°f(Reactants)
ΔH°reaction= (-2* 393.5 - 2*285.8) - (52.4 + 0) kJ/mol
ΔH°reaction = -1.41 *10^3  kJ/mol