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When 25.0mL of .500M H2SO4 is added to 25.0mL of 1.00M KOH in a coffee cup calorimeter at 23.50 degree Celcius, the temperature rises to 30.17 degree celcius. Calculate ethalpy of this reaction.
What proportion of the molecules have enough speed to escape when the temperature is (a) 240 K, (b) 1500 K? Calculations of this kind are very important in considering the composition of planetary a
The temperature rose by 0.910 K. In a separate experiment in the same calorimeter, the combustion of 0.825 g of benzoic acid, for which the internal energy of combustion is -3251 kJ mol-1, gave a te
In the reaction P4 + 5 O2 → 2 P2O5, how many moles of O2 are consumed each time 0.5 moles of P2O5 form?
KCl has the same structure as NaCl (Face-centered). The length of the unit cell is 628 pm. The density of KCl is 1.984 g/cm^3, and its formula mass is 74.55 amu. Using this information, calculate A
What will be the enthalpy change (to 2 significant figures) for the reaction when 1.5 g of lithium metal reacts with chlorine gas at constant pressure?
Write balanced molecular, ionic, and net ionic equations for the reactions of chromium (gives Cr3+) with solution of dilute sulfuric acid to give hydrogen plus the metal ion in solution (assume full
If a 10. m3 volume of air (acting as an ideal gas) is at a pressure of 760 mm and a temperature of 27 degrees Celsius is taken to a high altitude where the pressure is 400. mm Hg and a temperature o
What is the titer of the iodine solution of the .1137 sample of pure ascorbic acid, 26.75 mL I2 required to reach starch end point?
Are the two samples necessarily the same compound? How would you ascertain unambiguously that they were identical using TLC only? Be specific about your answer.
what mass of aspirin can be prepared by reacting 5.00 g if salicylic acid with an excess of acetic anhydride?
What advice would you give the company regarding environmental conditions that would maximize the percentage yield of ammonia?
Write the condensed electron configurations for the Cr^3+ atom. Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. For exa
when you have a solution of potassium chlorate containing 4g at 65 degress celcius. How many additional grams of solute must be added to it to make the solution saturated?
Write complete ionic equation to show the reaction of aqueous Hg2(NO3)2 with aqueous sodium chloride to form solid Hg2Cl2 and aqueous sodium nitrate.
The combustion of 45.0 of methane (natural gas) releases 2498 of heat energy. How much energy in kilocalories would combustion of 0.500 ounces of methane release?
What is the cutoff temperature at which the reaction is spontaneous?
How much energy would be absorbed as heat by 75 g of iron when heated from 295 K to 301 K? (Cp for iron= 0.449 J/g*C)
You drop a 142-g piece of brass (density = 8.56g/cm3) into the water. To what height does the water risein the graduated cylinder?
a 125 g metal block at a temperature of 93.2 degrees Celsius was immersed in 100 g of water at 18.3 degrees celsius. Given the specific heat of metal (s= 0.900j/g x degrees celsius), find the final
A sample of air from the basement of a home is found to contain 8.3 ppm of radon. What is the partial pressure of radon in the basement if the total pressure is 755 torr? A. B. C. D. E. 6.8 104 mol
A compound contains 10.13g of C and 89.87g of Cl. Determine both the empirical and molecular formulas of the compound given that the molar mass for the molecular formula is 237g/mol.
Calculate the expected change in temperature for 4.5 g of NH4NO3 dissolved in 100.0 mL of H2O. Assume that the calorimeter absorbs no heat.
Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas are formed when 48.7 g of sodium are added to water?
The molar mass of corn oil is 890g/mole. How many moles and how many grams of sodium hydroxide are required to react with the 15mL (13.7g) of corn oil? Show your calculations a. Calculate the number