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1. What is a sign for the thermochemical process of melting NaCl?
2. 150 g sample of metal at 80oC added to 150 g of H2O at 20oC. The temperature rises to 23.3oC. what is aa specific heat of metal? Specific heat of water is 4.18 J/g.oC.
3. Calculate the enthalpy change ?Ho for the reaction:C3H6(g) + 4.5O2(g) ? 3CO2(g) +3H2O(l)
Hof , kj/mol: C3H6(g) =21; CO2(g)= - 394; H2O= - 286
4. A commercial product called "Instant Car Kooler" containes 10 wt.% of Etanol, and 90 wt.% of water. If the interior of your car is overheated, you spray the product inside and the interior is cooled. To drop the air temperature from 55oC to 25oC requires air to give up 3.6 kj. How many grams of the above product must be used to absorb this heat?
The enthalpy of vaporization for ethanol is 850 j/g, and for water it is 2360 j/g.
Consider that a certain wastewater treatment plant returns 4.55 million gallons per day of treated water into a local stream, and that 2.2 mg of chlorine are added to each liter of treated water for e. coliremoval.
What information does a chemist obtain from the mass spectrum of a compound?
dehydrohalogenation of 2-bromo-2,3-dimethylbutane with a strong base can lead to multiple products with the zaitsez product being the favored product. what is this product.
Reactant: water and 2.51 g of SbCl3 Product: 1.906 g of a solid of antimony, oxygen and chlorine, and 0.802 g of a single gas that is 97.20% chlorine and 2.75% hydrogen What is the empirical formula of the gas and the solid
The chemist used a thermometer that was miscalibrated by 2(degrees)c over the entire thermometer scale. will this factory error cause the reported energy of neutralization to be higher, lower, or unaffected? explain.
Trichloroethane, C2H3Cl3, is the active ingredient in aerosols that claim to stain-proof men's ties. Trichloroethane has a vapor pressure of 100.0 mm Hg at 20.0 C and boils at 74.1 C
a variety of ions with na k nh4pb2 fe2 no3- cl- br- s2- and co32- are addednbsp in a beaker of h2o which substances
The equilibrium contant Kc for the reaction HF(aq)+H20(l)-->H30+(aq)+F-(aq) is 3.5x10^-4. What is the equilibrium concentraction of H30+ if the initial concentration of HF is 1.0M
Americium-241 is used in smoke detectors. It has a rate constant for radioactive decay of k = 1.6x10-3yr-1. What is the half-life of this isotope in years? Give your answer to 3 significant figures.
Classify the set of solutions based on the movement of solvent from the first solution listed to the second solution listed as osmosis or reverse osmosis.
A 5.5 g sample of metal at 100.0 degrees celsius is placed in a calorimeter with 20.0 g of water at 15.0 degree celsius. If the temperature of the water rises to 21.0 degrees celsius, what is the specific heat of the metal?
if your input is a radiative heat source at 150 C, what is the rate at which heat needs to be added to produce the desired work and at what temperature will the engine dump exceess heat?
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