Do the following calculations and write answers with correct significant figures

Question

Do the following calculations and write answers with correct significant figures? 23.45 + 12.260 - 0.059/9.0 = (12.6/3.0)+ (22.5 times 12.4) = Write balanced chemical (molecular), complete Ionic and net ionic equations for the following metathesis reactions: CdCl_2(aq) + Na_2S(aq) rightarrow (do not forget to write a phase of each ions end compounds) Balanced Molecular equation: Complete ionic equation: Nat Ionic equation: NiCI_2(aq) + AgNO_3(aq) rightarrow Balanced Molecular equation: Complete ionic equation: Not Ionic equation: A 136g of aqueous solution changed the temperature from 26.5 to 24.3 degree C when a reaction took place. Calculate the enthalpy delta H change in kj of this reaction. delta H = - (C_p times m times delta t), where the specific heat of water, C_p = 4.18J/g degree C.

Explanation / Answer

8.    23.45 + 12.260-0.059/9     = 35.651/9   = 3.96

9 .    12.6/3 + 22.5*12.4          = 4.2 +279   = 283.2

10. CdCl2(aq) + Na2S(aq) -------> CdS(s) + 2NaCl(aq)

      Cd+2(aq) +2Cl-(aq) + 2Na+(aq) +S2-(aq) -------> CdS(s) + 2Na+(aq) +2Cl-(aq)

   Removal of spectator ions to get net ionic equation

Cd+2(aq) +S2-(aq) -------> CdS(s) net ionic equation

b. NiCl2(aq) + 2AgNO3(aq) ---------> 2AgCl (s) + Ni(NO3)2(aq)

     Ni+2(aq) +2Cl-(aq) + 2Ag+(aq) +2NO3-(aq) ---------> 2AgCl (s) + Ni+2(aq) +2(NO3)-(aq)

   Removal of spectator ions to get net ionic equation

2Cl-(aq) + 2Ag+(aq) ---------> 2AgCl (s) net ionic equation

   

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