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When 19 g KOH is dissolved in 97.1 g of water in a coffee-cup calorimeter, the temperature rises from 18.1 °C to 33.81 °C. What is the enthalpy change per gram (in J/g) of KOH dissolved in the water? Assume that the solution has a specific heat capacity of 4.18 J/g×K. Water has a density of 1.00 g/ml. Be sure to enter the correct sign (+/-). Enter to 1 decimal place.
The heat of combustion of CH4 is 890.4 kJ/mol and the heat capacity of H2O is 75.2 J/mol×K. Find the volume of methane measured at 298 K and 0.790atm required to convert 1.33L of water at 298 K to water vapor at 373 K.
The magnesium weighing 355g in a sample of water is first converted to MgNH4PO4 and then to Mg2P2O7. The mass of Mg2P2O7 obtained is 0.0870g. Express the quantity of magnesium in the mineral water in parts per million (that is, in g Mg per 10^6 g ..
What is the total pressure in a 20.0 L flask 20.0°C, which contains 0.127 moles of H2 and 0.288 moles of N2?
individual suffering from a high cholesterol level in her blood has 239 of cholesterol per 100 of blood. If the total blood volume of the individual is 5.4 , how many grams of total blood cholesterol does the individual's body contain?
what are the [H3O^+] and OH^-] for a solution with each of the following pH values? a)10.0 b)5.0 c)6.5 d)1.82
Define the normal boiling point of a liquid. Explain why atmospheric pressure affects boiling points of liquids.
Explicate why the gem-dimethyl groups emerge as separate peaks in the proton NMR spectrum of isoborneolwhile they are an unresolved singlet in borneol.
After the Ketone react with sodium borohydride in ethanol. HCl be added dropwise, and then remove the ethanol by distillation, then add DCM and ice water.
What is the solubility of M(OH)2 (Ksp = 3.2e-13) in a solution buffered at pH = 9.84 solubility = M
at 25 C and 1.0 atm, .25 g of a gas dissolves in 1.00L of water. what mass of the gas dissolves in 1.00L of water at 25C and 3.0 atm
How many liters of antifreeze ethylene glycol [CH2(OH)CH2(OH)] would you add to a car radiator containing 6.50 liters of water if the coldest winter temperature is -40.0C. Calculate the boiling point of this water-ethylene glycol mixture.
Which of the following elements has the Lewis symbol below, where Sy represents the elemental symbol? Sy :
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