Throughout this expermint we assume that the heat capacity of the polystyene cups , stirrer and...
Throughout this expermint we assume that the heat capacity of the polystyene cups , stirrer and thermometer is zero. This assumption is obviously incorrect. What effects will the neglect of the heat capacity of the apparatus have on your calculated delta H value??
Homework Answers
The assumption of heat capacity of polystyrene cup, stirrer and thermometer are zero is incorrect. If they are not taken as zero as assumed, the net calculate dH would then be lower than the experimental value as calculate due to some heat absorbed by the polystyrene cup, stirrer and the thermometer.
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Throughout this expermint we assume that the heat capacity of
the polystyene cups , stirrer and...
cork thermometer plastic lid ← stirrer insulator ring reservoir ice and water aluminum container Figure 5.1:...
cork thermometer plastic lid ← stirrer insulator ring reservoir ice and water aluminum container Figure 5.1: A Simple Calorimeter In the other direction, when the phase change is from liquid to solid, the sample must release the same amount of energy. For water at its normal freezing or melting temperature, Lf=79.5 cal/g = 333 kJ/kg (5.2) This lab employs a double-wall calorimeter as shown in Figure 5.1 to measure the heat of fusion for ice. The calorimeter consists of an...
In a chemistry lab-Calorimetry and heat of reaction we used coffee cups and thermometers to measure...
In a chemistry lab-Calorimetry and heat of reaction we used coffee cups and thermometers to measure the heat of reactions of 3 different solutions (also using Hess' Law) 1. KCl + H2O 2. NaOH+HCl 3. Acetic acid + NaOH in all three calculations for q=mc(delta)T, we assumed that the final solutios all had the same density and heat capsity as pure water and in the post lab it asks: Comment on the validity of asuming that the final solutions in...
In heat transfer, if we neglect the lumped capacity system approach and use the heat diffusion eq...
In heat transfer, if we neglect the lumped capacity system approach and use the heat diffusion equation to solve transient conduction problems, why do they consider infinite and semi infinite geometries? and what are the differences between infinite and semi infinite for spheres/plates or cylinders?
Calculating specific heat capacity A constant-pressure calorimeter is often used to find the specific heat capacity...
Calculating specific heat capacity A constant-pressure calorimeter is often used to find the specific heat capacity of a substance if it is not known. A known mass of the substance can be heated and added to water of known mass and initial temperature. Since the specific heat capacity of water is known ( C s,water =4.184J/(g⋅ ∘ C)) , the amount of heat transferred to the water can be calculated by measuring the final temperature of the mixture at thermal...
In an experiment to measure the specific heat capacity of aluminium, identical size copper and aluminium...
In an experiment to measure the specific heat capacity of aluminium, identical size copper and aluminium blocks were alternately placed in an insulated calorimeter and heated by an electrical heater. The electrical heater supplied an identical energy E to the metal blocks. It was assumed that the heat loss (h) from both calorimeter measurements was identical. The measured masses were 530 g for the aluminium block and 1700 g for the copper block. The temperature rises were 15.3oC for the...
Part A Constants | Periodic Table The molar heat capacity Cp,m of SO2 (g) is described by the fol...
Please help me solve for delta H, I can't get it.
Thank you!
Part A Constants | Periodic Table The molar heat capacity Cp,m of SO2 (g) is described by the following equation over the range 300 K
93.2 LP 4. The specific heat of iron is 0.450 J/g.K. a) What is the heat capacity of a 25.0 g block of iron? b) Wha...
93.2 LP 4. The specific heat of iron is 0.450 J/g.K. a) What is the heat capacity of a 25.0 g block of iron? b) What is the value of the molar heat capacity of iron? del 4 rimetry involves the measurement of heat flow from one object undings). The instrument chemists use to measure changes in h mposed of an insulated container (like a Styrofoam cup) contain water. A reaction vessel is also placed inside the water - this...
can someone check my math for #59 and #60? i feel like my answers are incorrect. Part IV. Specific Heat Capacity o...
can someone check my math for #59 and #60? i feel like my
answers are incorrect.
Part IV. Specific Heat Capacity of an Unknown Metal 52. Volume of water 100 mL 53. Calculate the mass of water 54. Mass of unknown metal 05.a 55. Initial temperature of water in calorimeter, T "C 56. Initial temperature of metal before placing in calorimeter, T C 24.8 57. Final temperature of the water, T C 58. Final temperature of the metal, T C...
a) If we assume the population mean is 98.60 and the standard deviation is 0.6, what...
a) If we assume the population mean is 98.60 and the standard deviation is 0.6, what is the probability of a single person having a temperature of 98.25 or less? (Round to four decimal places. This should be the theoretical probability that is calculated, NOT the empirical probability from the simulation.) b) If we assume the population mean is 98.60 and the standard deviation is 0.6, what is the probability of obtaining a sample mean of 98.25 or less from...
AIR HEATING/COOLING HEAT PUMP sketch of a heat pump receiving outdoor air, determine the following. Assume the heat capacity of air is 1.0 kJkg-K. (a) If the supply air mass flow rate and tempera...
AIR HEATING/COOLING HEAT PUMP sketch of a heat pump receiving outdoor air, determine the following. Assume the heat capacity of air is 1.0 kJkg-K. (a) If the supply air mass flow rate and temperature (Point 3) are 0.8 kg/s and 39.7"C, and the return air temperature (Point 4) is 22C, the heating rate of the heat pump is kW. (Express your answer to one decimal place.) itthere is NO heat reco e yurt and 25% of the air is exhausted...
cork thermometer plastic lid ← stirrer insulator ring reservoir ice and water aluminum container Figure 5.1: A Simple Calorimeter In the other direction, when the phase change is from liquid to solid, the sample must release the same amount of energy. For water at its normal freezing or melting temperature, Lf=79.5 cal/g = 333 kJ/kg (5.2) This lab employs a double-wall calorimeter as shown in Figure 5.1 to measure the heat of fusion for ice. The calorimeter consists of an...
Please help me solve for delta H, I can't get it.
Thank you!
Part A Constants | Periodic Table The molar heat capacity Cp,m of SO2 (g) is described by the following equation over the range 300 K
93.2 LP 4. The specific heat of iron is 0.450 J/g.K. a) What is the heat capacity of a 25.0 g block of iron? b) What is the value of the molar heat capacity of iron? del 4 rimetry involves the measurement of heat flow from one object undings). The instrument chemists use to measure changes in h mposed of an insulated container (like a Styrofoam cup) contain water. A reaction vessel is also placed inside the water - this...
can someone check my math for #59 and #60? i feel like my
answers are incorrect.
Part IV. Specific Heat Capacity of an Unknown Metal 52. Volume of water 100 mL 53. Calculate the mass of water 54. Mass of unknown metal 05.a 55. Initial temperature of water in calorimeter, T "C 56. Initial temperature of metal before placing in calorimeter, T C 24.8 57. Final temperature of the water, T C 58. Final temperature of the metal, T C...
AIR HEATING/COOLING HEAT PUMP sketch of a heat pump receiving outdoor air, determine the following. Assume the heat capacity of air is 1.0 kJkg-K. (a) If the supply air mass flow rate and temperature (Point 3) are 0.8 kg/s and 39.7"C, and the return air temperature (Point 4) is 22C, the heating rate of the heat pump is kW. (Express your answer to one decimal place.) itthere is NO heat reco e yurt and 25% of the air is exhausted...
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