10/28/20

Chemistry Lab Question
Assume that you carried out today’s reaction, but didn’t measure the masses of either the KClO3 starting material or the KCl product. However, you were able to determine that 0.65L of O2 gas was... more
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10/28/20

Chemistry Lab Question
Assuming the same sort of reaction occurs (ie: release of O2), write the balanced equations for the decomposition of Potassium Hypochlorite, Sodium Chlorite, and Lithium Perbromate.
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10/28/20

Phase Change Energetics
The following information is given for iron at 1 atm: boiling point = 2750 °C Hvap(2750 °C) = 354 kJ/mol melting point = 1535 °C Hfus(1535 °C) = 16.2 kJ/mol specific heat solid... more
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10/28/20

phase change energetics
The following information is given for mercury, Hg, at 1 atm: boiling point = 357 °C Hvap(357 °C) = 59.3 kJ/mol melting point = -38.9 °C Hfus(-38.9 °C) = 2.33 kJ/mol specific heat... more
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10/28/20

Thermal equilibrium
In the laboratory a student determines the specific heat of a metal.He heats 18.7 grams of nickel to 98.36 °C and then drops it into an insulated cup containing 81.2 grams of water at 21.50 °C.... more
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10/28/20

Thermal equilibrium
A chunk of aluminum weighing 18.5 grams and originally at 98.95 °C is dropped into an insulated cup containing 77.6 grams of water at 21.43 °C.Assuming that all of the heat is transferred to the... more
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10/28/20

Specific Heat to Energy Temperature(pls help)!!
A sample of gaseous hydrogen is heated with an electrical coil. If 2.58×103 Joules of energy are added to a 11.8 gram sample initially at 21.0 °C, what is the final temperature of the hydrogen?What... more
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10/27/20

Match each chemical reaction with the energy associated with the reaction.
Match each chemical reaction with the energy associated with the reaction.1)    Cu+(g)  Cu2+(g) + e‾ [first ionization, second ionization]   2)    N(g)  N+(g) + e‾ [first ionization, second... more
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10/27/20

Thermochemical Reaction
Consider the following generic thermochemical reaction: 2A + 3B → 2C  ∆Hrxn = -100 kJIf a reaction contains 5 mol A and 6 mol B, how much heat will have evolved once the reaction has gone as far as... more
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10/27/20

Calculate the amount of heat required to melt an ice cube with a mass of 250 g and a temperature of -20 degrees celsius and turn it to steam at 120 degrees celsius
Use joules please. not mole ........................................................
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10/27/20

Assume the imaginary metal, M, forms an cation with a +3 charge, M3+. The formula of the salt formed should go in the very last blank on the right.

Balance the equation by typing in the smallest whole-number coefficients that would balance the equation in front of each reactant and product formula. Normally, a coefficient of one is not shown,... more
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10/27/20

A solution is prepared by dissolving 0.0627 grams of (NH4)2Ce(NO3)6 in 1.72 L of water. Calculate the concentration of NO3- in this solution in mg/L (ppm).
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10/27/20

In a titration of 25.00 mL of X solution, 32.55 mL of 0.8323 M Y solution are required to reach the end-point. What is the concentration of the 25.00 mL of X? X + 3Y → 3W + Z
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10/27/20

C3H8 + 5 O2 → 3 CO2 + 4 H2O
a. How many liters of propane(C3H8) will produce 5.67 liters of carbon dioxide? b. How many moles of propane are needed to produce 5.67 liters of carbon dioxide?c. What mass of propane is needed to... more
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10/27/20

Octane (C8H18) vapor burns to produce carbon dioxide gas with water vapor. What is the balanced equation?
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10/26/20

If 28.1 g of Ar(g) occupies a volume of 4.56 L, what volume will 1.15 moles of Ne(g) occupy at the same temperature and pressure?
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10/26/20

Practice: Show your work!
Convert 740.0 mm Hg to kPa
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10/26/20

If 5.700 g C6H6 is burned and the heat produced from the burning is added to 5691 g of water at 21 ∘ C, what is the final temperature of the water?
The balanced combustion reaction for C6H6 is 2C6H6(l)+15O2(g)⟶12CO2(g)+6H2O(l)+6542 kJ
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10/26/20

How much oxygen gas is produced in L if the reaction occurs at 34.4 ºC and 1.00 atm pressure?

A person accidentally mixes bleach (sodium hypochlorite solution) with hydrogen peroxide solution. The following reaction occurs and produces oxygen gas. 18.8 grams of NaClO were present... more
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10/26/20

Titration: Back Titration
44.2 mL of 1.27 M hydroiodic acid is added to 22.6 mL of calcium hydroxide, and the resulting solution is found to be acidic.28.2 mL of 1.33 M sodium hydroxide is required to reach neutrality.What... more
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10/26/20

change in enthalpy
In a constant‑pressure calorimeter, 58.7 mL of 0.930 M H2SO4 was added to 58.7 mL of 0.500 M NaOH.The reaction caused the temperature of the solution to rise from 22.30 °C to 26.01 °C. If the... more
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10/26/20

change in enthalpy
A calorimeter was used to measure the heat change when an ionic compound dissolves in water. The final mass of the contents of the calorimeter was 51.13 g and the change in temperature was 3.01... more
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10/26/20

Titration: Back Titration
33.7 mL of 1.54 M hydrochloric acid is added to 31.2 mL of sodium hydroxide, and the resulting solution is found to be acidic.16.4 mL of 1.19 M barium hydroxide is required to reach neutrality.What... more
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10/26/20

TRUE ON ΔE sys = -95 J
Which of the following is  true if ΔE sys = -95 J?A. Both the system and the surroundings are losing 95 J.B. The system is gaining 95 J, while the surroundings are losing 95 J.C. Both the system... more
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10/26/20

What is the pH of a solution of 0.300 M HNO₂ containing 0.170 M NaNO₂? (Ka of HNO₂ is 4.5 × 10⁻⁴)
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