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In a coffee-cup calorimeter, 1 mol KOH and 1 mol HBr initially at 23.5 oC (Celsius) are mixed in 100g of water to yield the following reaction: KOH + HBr ? K+(aq) + Br-(aq) + H2O(l) After mixing the temperature rises to 78.2 oC. Calculate the change in enthalpy of this reaction. Specific heat of the solution = 4.184 J/(g oC) State your answer in kJ with 3 significant figures. Don't forget to enter the unit behind the numerical answer. The molecular weight of KOH is 56.2 g/mol, and the molecular weight of HBr is 80.9 g/mol.
Calculate the pH at the equivalence point in titrating 0.100 M solution of sodium hydrogen chromate (NaHCrO_4 )with .080 M NaOH.
According to Boyle's law, for a fixed quantity of gas at a given temperature, what quantity relating pressure and volume is constant
a 1.70-g sample of a large biomolecule was dissolved in 14.0 g of carbon tetrachloride. the boiling point of this
If 323 g of magnesium reacts with excess oxygen to produce 296 g of magnesium oxide, what is the percent yield for the reaction?
a chemist is commissioned to produce 50000 liters of 0.550 m aqueous phosphoric acid. the chemist can purchase solid
What is the isentropic work required for the ideal gas case? C) If the comppressor has an efficiency of 0.78 and is NON-ideal, what is the final temp and required work?
There are 100 grams of water in the bucket, how much heat did the 100 grams of tungsten conduct to the water what was the initial temperature of the hot tungsten? Ctungsten = .04 cal/g×°C
At 2000°C the equilibrium constant for the reaction is Kc = 2.4 103. 2 NO(g) N2(g) + O2(g) If the initial concentration of NO is 0.100 M, what are the equilibrium concentrations of NO, N2, and O2
A sample of nitrogen gas had a volume of 500.ml, a pressure in its closed container of 740 torr, and a temperature of 25 degrees celsius. What was the new volume of the gas when the temperature was changed to 50 degrees celsius and the new pressur..
What observed rotation is expected when a 1.02 M solution of (R)-2-butanol is mixed with an equal volume of a 0.510 M solution of racemic 2-butanol
In a bad sporangiospores and fungi, are found in bag-like structures. Ascospores are also found in bag-like structures, but are always present in even numbers. Why are these spore types not the same?
Calculate the % ionization in a 0.3458 M solution of o-iodobenzoic acid. The Ka of o-iodobenzoic acid = 1.7 x 10-3.
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