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For the reaction,: Ca(OH)2(s)+ CO2(g)= CaCO3(s)+ H2O(g) (a) Use the following standard enthalpies of formation to calculate the enthalpy change. Ca(OH)2(s)= -986.09 kJ/mol CO2(g)= -393.509 kJ/mol CaCO3(s)= -1206.92 kJ/mol H2O(g)= -241.818 kJ/mol (b) Is the reaction endothermic or exothermic?
The solubility product constant of Sr(IO3)2 is 1.14 × 10?7. What volume of 0.0485 M S2O32 is required to titrate a 15.0 mL sample of a saturated solution Sr(IO3)2
Condensation polymers are made using a monomer with two functional groups which split off as the remainder of the two monomers are joined together. Often the small molecule eliminated in the process is water
From the same container under the same conditions--same temperature and initial pressure, it takes 385 s for 7.00 L of O2 gas to effuse. Calculate the molar mass (in grams/mol) of the unknown gas.
The osmotic pressure of a solution formed by dissolving 85.0 mg of aspirin (C9H8O4) in 0.250 L of water at 25 °C is __________ atm.
Manometers can use liquids other than mercury to measure small pressure differences. On a day when the barometric pressure is 764.3 torr, a water manometer, connected between the atmosphere and a glass bulb
It is common to see the the strength of aspirin tablets listed in terms of the number of grains of ASA per tablet. using the conversion factor of 15.4 grains per gram ASA,
The molar mass of an unknown salt is 75.6. If 2.29 g is added to 71.2 mL of water the temperature changes from 20.70oC to 21.39oC. What is the molar heat of solution (J/mol) of the salt?
the air feels cool because heat is required to evaporate the water from our skin. How much heat is required to evaporate 20.6 g of water? The enthalpy of vaporization of water is 44.0 kJ/mol.
If 0.50 mole H2 and 1.0 mole He are compared at standard temperature and pressure, the two gases will: a. have equal effusion rate
When methanol, CH3OH, is dissolved in water, a nonconducting solution results. When acetic acid, CH3COOH, dissolves in water, the solution is weakly conductiong and acidic in nature. Describe what happens upon solution dissolution in the two cases..
Some enzymes require a nonprotein prosthetic group in order to function. The nonprotein part of these enzymes are called
Preliminary analysis suggests that the air stable form of setonium has a radius of 130 pm. Predict the formula of the form (cation, anion or oxide) in which it would likely be found in a beaker of pH 5.5 to 7 water.
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