a)
A: Copper
B: CuO
C: 
D: $\mathrm{CuCO_3}$
E: $\mathrm{CO_2}$
F: $\mathrm{Cu(NO_3)_2}$
b)
$\mathrm{CuO+ H_2SO_4}\rightarrow \mathrm{CuSO_4 + H_2O}$
c)
$\mathrm{CuCO_3+ 2HNO_3}\rightarrow \mathrm{Cu(NO_3)_2+ CO_2+ H_2O}$
Yes, they are right.Very good hand writing! You did a very great job on showing your work.
Answer:
The answer is its equal to the volume of its container.
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I hope this helps! :)
Each of the Nitrogen atoms has 2 non bonded valence electrons, meaning that there are 4 pairs total.