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calculate the amount of energy as heat by the freezing of 13.3 g of a liquid substance. given that the substance has a molar mass of 82.9g/mol and a molar enthalpy of fusion of 4.60 kj/mol.
A certain quantity of a gas occupies 61.3 mL at 68 ?C. If the pressure remains constant, what would be the volume of the gas at 128 ?C?
What is the molality of a solution prepared by dissolving 413 mg of KBr in 6.45 mL of water at 25.0 0C. The density of water at 25.0 0C is 0.997 g/mL.
Compare the chemical structure of the nylon polymer that has been prepared to the polypeptide trimer of glycine, the simplest of the naturally occurring amino acids
During a refueling outage, workers discover black, soft material in the reactor core (obviously a Foreign Materials Exclusion Area breech). To help identify the breech source, you are asked to determine the material
how many moles are present of an ideal gas at the following conditions: 1.0 atm, 25.0 C, and occupying 22.4 L, The Lewis structure for PF3 shows that the central phosphorus atom has _______ nonbonding and
A 1.20 M solution of citric acid (H3C6H5O7) in water has a density of 1.10 g/cm3. Calculate the normality. Citric acid has three acidic protons.
How many grams of methane gas (CH4) need to be combusted to produce 12.5 L water vapor at 301 K and 1.1 atm? CH4 (g) + 2 O2 (g) -> CO2 (g) + 2 H2O (g)
Write equations to show how nitronium ions might be formed using a mixture of nitric and sulfuric acids
Determination of the composition of a mixture You will be given a multi-component mixture and will be required to determine (and confirm) the %composition of the mixture, obtain a sample of each component and to verify its purity and identity.
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.160 M HClO(aq) with 0.160 M KOH(aq). The ionization constant for HClO 4.0*10-8.
How much heat is required to warm 227 g of ice from -45.5°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C.
At a fixed temperature and pressure, how does the value of the heat of sublimation of a substance compare with that of its heat of deposition?
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