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I am using Sodium Carbonate Peroxyhydrate to control filamentous algae in a garden pond.
After adding the SCP at a rate of .5lb/2800 USG the pH rises to 8.
Can I add sodium bisulfate at a rate of 150g to the SCP or only afterwards to the body of water in order to return the pH to 7?
a) How many moles of solid residue remained in the crucible?
b) How many moles of substance were lost during the experiment?
c) Calculate the value of x in the formula ZnSO4.xH2O.
C2H4(g) + H2(g)→C2H6(g)
given that the enthalpy of combustion
for the reactants and products are:
∆Hºc(C2H4)(g) = -1411 kJ mol^-1∆Hºc(C2H6)(g) = -1560 kJ mol^-1∆Hºc(H2)(g) = -286 kJ mol-1.
2. Calculate the enthalpy change of
combustion for ethene gas (C2H4) given the
following enthalpy changes of formation:
∆Hºf(C2H4)(g) = +52 kJ mol^-1∆Hºf(CO2)(g) = -394 kJ mol^-1
∆Hºf(H2O)(g) = -286 kJ mol^-1
3.Calculate the standard entr
opy change for the reaction:
given the standard entropies
Sº(N2)(g) = 191.6 J K^-1 mol^-1
Sº(H2)(g) = 130.6 J K^-1 mol^-1
Sº(NH3)(g) = 193.3 J K^-1 mol^-1
Express your answer as a chemical equation. Identify all of the phases in your answer.