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A chemical reaction at equilibrium is heated, briefly, by holding it over a flame. The equilibrium is seen to shift toward the products. What can be said about the enthalpy and entropy of the reaction?
- We can not determine the sign or the value of the entropy change
- The entropy change must be negative, but we don't know the value
- The entropy change must be positive, but we don't know the value
- The entropy change can not be determined
- The enthalpy change could be negative( excothermic)
-The enthalpy change could be positive( endothermic)
-The sign of both the entropy and enthalpy change depends on the tempreature change.
The heat capacity of a bomb calorimeter is found to be 5.68 kJ/oC. When a 1.652 g sample of glucose is burned in the calorimeter, the temperature of the calorimeter increases from 24.56 oC to 29.10 oC. Calculate the heat of combustion of glucose.
Write a Lewis structure for each of the following molecules.
What is the the molar composition of the products when a stream of CH4 is combusted with 5% excess air if you have 1600 moles per hour of methane being fed into the reactor
A sample of nitrogen gas had a volume of 500. mL, a pressure in its closed container of 740.0 torr and a temperature of 25.0°C.
The nitrogen in a 4-tablet sample that weighed a total of 7.50 g was converted to ammonia by Kjeldahl digestion, followed by distillation into 100.0 mL of 0.1750 M HCl. The analysis was completed by titrating the excess acid with 11.37 mL of 0.108..
Explain the following trends in lattice energy. (Select all that apply.) (a) NaCl > RbBr > CsBr CsBr is smaller than RbBr and NaCl. NaCl is smaller than RbBr and CsBr
What is the empirical formula for an prganic compound whose percentage composition is 40.0% carbon
A gas expands and does P-V work on the surroundings equal to 259 J. At the same time, it absorbs 216 J of heat from the surroundings. What is the change in energy of the system?
Calculate the heat evolved when 306 g of white phosphorus (P4) burns in air according to the equation below.
before addition of any HCl (b) after addition of 25.0 mL of HCl (c) after addition of 50.0 mL of HCl (d) after addition of 100.0 mL of HCl
The half life for the radioactive decay of C-14 is 5730 years and is independent of the initial concentration. How long does it take for 25% of the c-14 atoms in a sample of C-14 to decay?
Lime, CaO, is produced by reaction CaCO3(s) CaO(s) + CO2(g). What weight of CaO is obtained by the decomposition of 38.7g of CaCO3.
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