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What amount of the substance is contained in the crystalline hydrate CuSO 4 ∙ 5H 2 O weighing 50 g?
6.For salts: 1) CrCl 3 ; 2) Na 2 CO 3 ; 3) NaNO 2 ; 4) KCl, compose the shortened ionic-molecular and molecular hydrolysis equations for stage I and determine the pH of the solution (<7,> 7 = 7, ≈7).
5.Calculate the mass of zinc sulfate required to prepare 0.4 l of a solution with a mass fraction of 30% and a density of 1.378 g / ml.
4.What pressure (Pa) will carbon monoxide ( II ) create with a mass of 140 g at a temperature of 40 ° C in a container with a volume of 200 liters?
3 Arrange the oxidation states in molecules and ions:
С aSO 4 , К 2 MnO 4 , (ClO) - , (CrOH) 2 + , (HSO 3 ) -
2.In a redox reaction
Fe 2 O 3 + KNO 3 + KOH = K 2 FeO 4 + KNO 2 + H 2 O
find an oxidizing agent and a reducing agent, arrange the coefficients by any method (electronic or ion-electronic balance).
If 2.0 moles of H2O(g) are converted to H2(g) and O2(g) against a pressure of 1.0 atm at 125˚C, what is the ∆E for this reaction?
In the reaction A → 3B the [ A ] changes from 1.00 mol / L at 0.00 s lo 0.50 mol / L at 2.00 s What is the average reaction rate in moles of A consumed per liter per second ?
Propane (C3H8) burns according to the following balanced equation: C3H8(g)+5O2(g)→3CO2(g)+4H2O(g) Part A Calculate ΔH∘rxn for this reaction using standard enthalpies of formation. (The standard enthalpy of formation of gaseous propane is -103.9 kJ/mol .) Express the enthalpy in kilojoules to four significant figures.
Zinc metal reacts with hydrochloric acid according to the following balanced equation: Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g) When 0.119 g of Zn(s) is combined with enough HCl to make 51.3 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 22.5 ∘C to 24.1 ∘C. Part A Find ΔHrxn for this reaction as written. (Use 1.00 g/mL for the density of the solution and 4.18 J/(g⋅∘C) as the specific heat capacity.) Express your answer in kilojoules per mole to two significant figures.
