Chemistry Answers

Calculate for the specific heat of 28.0 g of of mercury (Hg)

when 137 J of energy is involved when raised at an initial

temperature of 22.0°C to a final temperature of 570C.

Calculate the mole fraction of solute in the aqueous solution of 13% C₂H₅OH.

What volume did a helium-filled balloon have at 26.8 °C and 1.87 atm if its new volume was 63.2 mL at 2.22 atm and 9.6°C? O a. 79.6 O b. 209 O c. 70.7 O d. 56.5

Balance the following redox reactions: (8pts, 4pts each)

              a) Cu (s) +  NO₃^- (aq)       à      Cu²⁺(aq)     +  NO (g)        (acidic medium)

Oxidation Half Reaction:

Reduction Half Reaction:

Net Reaction:

              b)  MnO₄^- (aq) +  NO₂^-(aq)        à   Mn²⁺ (s)   +  NO₃^- (aq)     (basic medium)

Oxidation Half Reaction:

Reduction Half Reaction:

Net Reaction:

Treatment of a 0.25000-g sample of impure potassium chloride with an excess of AgNO3 resultion of 0.2912g of AgCl. Calculate the percentage of CCl in the sample.

Application of Charles’ Law can be seen as one flies in a hot air balloon, when heated, causes the air to expand; thus, becomes lighter and so it rises. Which of the following is another application of Charles’ Law?

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1 point

A balloon contains a mixture of 3 gases: oxygen, helium, and nitrogen. If the partial pressures of the three gases in the balloon are 25 atm of O₂, 7,600 torr of N₂, and 20 atm of He, What is the total pressure inside the balloon?

An electrochemical cell consists of a nickel electrode in an acidic solution of 1.00M Ni(No3)2 connected by a salt bridge for a second component with na Al electrode in acidic solution of 1M Alcl3. Calculate the change in voltage when the cell described above has initial conc of 0.500M Ni(No3)2 and 0.750 M Alcl3?

During an experiment, 78.0 grams of CH4 reacts with 102.0 grams of O2 to produce water and carbon dioxide (CO2).

CH4 + 2O2 ---> 2H2O + CO2

Mole Ratio: Molar Mass Ratio:

1 mol CH4 = 1 mol CO2 1 mol CH4 = 16.01 g CH4

1 mol CO2 = 44.01 g CO2

AgF(aq) + Fe(CO3)3(aq)