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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.
When 284.5 g of ethylene (C2H4) burns in oxygen to give carbon dioxide and water, how many grams of CO2 are formed?
Halogenated compounds are particularly easy to identify by their mass spectra because chlorine and bromine occur naturally as mixtures of two abundant isotopes
What is the total number of liters of O2(g) produced from the complete decomposition of 0.500 mole of KClO3(s)?
A 750-mL sample of nitrogen was collected by displacement of water from a container at 30°C and an atmospheric pressure of 742 Torr. If the vapor pressure of water at 30°C is 31.8 Torr, calculate the number of moles of nitrogen gas produced.
Crystalline silicon has a cubic structure. The unit cell edge length is 543 pm. The density of the solid is 2.33 g/cm3. Calculate the number of Si atoms in one unit cell.
If 450 g SO2 escaped into the atmosphere and all the escaped SO2 were converted to H2SO4. How many grams of H2SO4 would be produced in the atmosphere?
A mixture of ammonium chloride and sand is placed in an evaporating dish and massed at 56.246g. The mixture is heated, driving off the ammonium chloride and massed again
compounds are dissolved in 1.00 L of w ater: 0.220 mol HA (K a = 1.36 x 10 - 3 ), 0. 18 mol NaA, 0.0 8 mol H 2 SO 4 , and 0.08 mol KOH . What is the pH of the resulting solution?
Nitrogen gas reacts with oxygen gas to produce nitrogen monoxide in an endothermic reaction. When the temperature of the reaction at equilibrium is raised, the equilibrium will shift
What is the buffer component ratio, ([BrO-]/[HBrO]) of a bromate buffer that has a pH of 7.88. Ka of HBrO is 2.3 x 10-9
how many grams of asprin were lost in the washing process you used to purify your product assuming you used 50ml if
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
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