Balanced chemical equation is:
HCl + NH3 ---> NH4Cl + H2O
Here:
M(HCl)=0.8 M
V(HCl)=18.2 mL
V(NH3)=5.0 mL
According to balanced reaction:
1*number of mol of HCl =1*number of mol of NH3
1*M(HCl)*V(HCl) =1*M(NH3)*V(NH3)
1*0.8*18.2 = 1*M(NH3)*5.0
M(NH3) = 2.912 M
Answer: 2.91 M
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