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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.
Calculate the mass of ethylene glycol (C2H6O2) that must be added to 1.00 kg of ethanol (C2H5OH) to reduce its vapor pressure by 13.6 torr at 35°C.
The mass of the isotope, I-129, is 128.905 amu while the atomic mass of the contaminated iodine sample is 127.1982 amu. What is the mass of the contaminant?
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
When an outside plastic envelope is removed, O2 molecules penetrate the paper causing the reaction to begin. A Typical packet contains 250 grams of iron to warm your hands or feet for up to 4 hours.
how many grams of sodium chlorida are in 100 ml of water if the vapor pressure of the solution is 630 torr 20 c? given
In a gas mixture, the partial pressures are nitrogen 0.559 ATM, oxygen 115 torr, and helium 0.296 mm Hg. What is the total pressure (in torr) exerted by the gas mixture
that forms when gaseous nitrogen dioxide pollutant reacts with gaseous oxygen and liquid water to form aqueous nitric acid. Write a balanced chemical equation for this reaction.
A mixture of Helium, Neon, and Nitrogen gases has a pressure of 1.348 atm. Determine what is the partial pressure of N2 in the mixture If the pressures of Helium and Neon are 0.124 atm and 0.996 atm, respectively.
Pure liquid water can be supercooled to temperatures below its freezing point. Consider 10 kg of water cooled as a liquid to -10 Celsius. Let's now add a small crystal of ice (whose mass is negligible) as a "seed"
the anharmonicity constant is 117.90 cm^-1. Calculate the frequency at which the Q branch for the first overtone will be found.?
If 400. mL of NO at STP is reacted with 500. mL of O2 at STP, calculate the partial presure of NO2 after the reaction goes to completion. Assume constant volume.
The following label was found on a bottle of liquid hydrocarbons in the laboratory of Dr. Ima Turkey following his disappearance under mysterious circumstances. Although the name defines a structure unambiguously
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