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q = m x C x ΔT
1. To produce heat, an instant heat pack uses a chemical reaction. Discuss the general chemistry behind the heat production by the heat pack (you do not need to discuss the specific reaction that occurs in a heat pack). Also describe the application of the law of conservation of energy to what's occurring in the heat pack and as the heat spreads to the surrounding environment.
2. You can use a calorimeter that contains water to find the specific heat of an object. Explain the general procedure involved in the calorimetry to determine the specific heat of a substance. Clearly state the data that would be collected in the calorimetry experiment and how the specific heat of the substance would be calculated.
3. 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 total mass of the solution is 525 g and the specific heat of the solution is 4.18 J/g °C (the same as water). What is the enthalpy of dissolving (DHdissolving) of in J/g ammonium nitrate? Work must be shown in order to earn credit.
Specified that the enthalpy of combustion of graphite is -393.5kJ/mol as well as that of diamond is -395.41 kJ/mol, compute the standard enthalpy of the C(s, graphite) àC s, diamond transition in kJ/mol. Use two significant figures as well as do n..
The reaction previously done was just having trans-cinnamic acid reacted with Br2 forming all the isomers with the double bond being broken and Br put into place.
Question- A 2.841g sample of a hydrocarbon is burned in an excess of dioxygen, producing 7.794 g CO2 and water. What mass of hydrogen is contained in the original sample
An inert gas occupies volume of 366 ml at temperature 41 oC and pressure 354 Torr. What volume does the gas occupy at standard ambient temperature and pressure (SATP)?
How much heat is needed to convert 10.0 g of ice at -25.0ºC to water at 80.0ºC?
If 66 ml of Ethanol (C2H5OH;D=.79 g/cc is dumped into 600 ml of water, what is the molality of the solution
An existing power plant has been found to produce SO2 concentration of 20?g/m3 at a distance of 800m directly downwind from the stack when the wind is 4m/s from the north during a class C stability situation.
How much time will it take a car travelling at 88 km/hr (55 mi/hr) to travel 500km? Show work for credit and include final units.
Standard Temperature and Pressure of Chlorine, Chlorine is widely used to purify municipal water supplies and to treat swimming pool waters. Suppose that the volume of a particular sample of Cl2 gas is 8.70 L at 895 torr and 240C.
Organic chemists when making a new solid compound often first try ethanol as a recrystallizing solvent. If soluble at room temperature, they add water and this often works. why
Using the calibration equation and the absorbance you measured for the prepared sample, calculate the ferroin concentration. Show your work and don't forget to include units.
small spheres of equal mass are made of lead density 11.3 rm grm cm3 silver 10.5 rm grm cm3 and aluminum 2.70 rm grm
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