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1. An instant heat pack uses a chemical reaction to produce heat. Explain the general chemistry behind the heat production by the heat pack. Also describe the application of the law of conservation of energy to the heat pack and the surrounding environment.
2. For an experiment, you have a calorimeter with 350 g of water at 24°C. 175 g of crystalline ammonium nitrate from a cold pack is placed into the calorimeter. When the ammonium nitrate finishes dissolving in the water, the temperature of the water inside the calorimeter is 5.5°C. The specific heat of water is 4.18 J/g °C.
3. What is the enthalpy of dissolving (DHdissolving) of the ammonium nitrate in J/g? Make sure to clearly show all of your work. You may need to use q = mΔHdissolving.You can use a calorimeter to find the specific heat of an object. Explain the steps involved and how to calculate the specific heat of a substance.
Draw Lewis dot structure and predict molecular geometry - Show the Lewis structures of the following molecules and then predict their geometry.
Predict the sign of Change in S for this reaction and explain. -Calculate the Change is S from standard molar entropy values. S for Na2O2(s) = 95 J/mol K
A 250 gram sample of water at the boiling point had 45.0 kJ of heat added. How many grams of water were vaporized? Heat of vaporization for water is 40.6 kJ/mole
A 10.0 lb bag of 20:10:5 fertilizer is 20.0% nitrogen by weight. a) Calculate how many grams of nitrogen are contained in the bag. (I got 907 grams of Nitrogen)
A 70.0 silver object and a 40.0 gold object are both added to 45.5 of water contained in a graduated cylinder. What is the new water level in the cylinder?
What volume is need to give 2L/min flow for 19200min with a tank pressure of 2500psi? Assuming Ideal behavior.
Introduction to the Nernst Equation Learning Goal: To learn how to use the Nernst equation. The standard reduction potentials listed in any reference table are only valid at standard-state conditions of 25 circ C and 1 M. To calculate the cell pot..
An ideal gas is expanded reversibly from initial conditions of Vi= 10 L and Ti = 25C to Vf= 100L and Tf= 150C calculate delta S
determine the specific heat of anbsp metal object of 19 grams that is heated to 96 degrees celsiusnbsp and added to a
Problem- Consider an isolated N-C bond in an organic compound. Based on the electronegativities of the two elements, which of the following best describes the net charge on the carbon atom
A buffer was prepared by mixing a solution that is 0.285 M in HA and 0.385 in A-. The pH of this buffer was 4.435. then to 405 mL of this buffer solution was added to 21.5 mL of 2.0 M HCl. What is the pH of this new solution?
Consider the titration of 51.5 mL of 1.2M NaOH with 1.0 M HCl. Find the PH at the following points. The acid volume needed to reach the equivalence point
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