Question

a+O2→CO2
CO2+b⇄d
b+na→e+f↑
f+O2→b
e+g→NaCl+b
NaCl+h→g+i

Answer 1

C + O2 = CO2
CO2 + H2O = H2CO3 (reversibil)
H2O + Na = NaOH + 1/2H2
H2 + 1/2O2= H2O
NaOH + HCL = NaCl + H2O
NaCl + HNO3 = HCL + NaNO3