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A chemistry student prepares acetone by decomposing 12.3 g of calcium acetate. If the student collected 2.50 g of acetone and the theoretical yield is 3.42 g, what is the percent yield?
At 25.0°C, a sample of Xe gas occupies 531 mL in a piston-cylider apparatus when the external pressure is 337 torr. At what pressure (torr) will its volume become 625 mL if the temperature does
Calculate the number of grams of nitrogen dioxide gas formed when 1.22 moles of ammonia, NH3, react with 2.14 moles of oxygen gas (O2) to produce nitrogen dioxide gas (NO2) and water (H2O).
How many grams of ammonium chloride (53.50 g/mol), must be dissolved in 265.0 grams of water to reduce the freezing point by 0.3000C ?
Calculate the number of grams of potassium chloride, KCl, that will be formed by the decomposition of 6.45 grams of potassium chlorate, KClO3. Oxygen gas, O2, is the other product.
What is the pH of a solution prepared by mixing 25.00 mL of a 0.10 M solution of the weak acid CH3CO2H with 25.00 mL of 0.040 M sodium acetate, CH3CO2Na?
An industrial process makes calcium oxide by decomposing calcium carbonate. Which of the following is NOT needed to calculate the mass of calcium oxide that can be produced from 4.7 kg of calcium ca
Calamine lotion contains a mixture of both zinc and iron oxides. A 1.022 g sample of dried calamine was dissolved in acid and diluted to 100.00 mL. Potassium fluoride (MW = 58.10 g/mol) was added to
Calculate the mass of propylene glycol ({rm{C}}_3 {rm{H}}_8 {rm{O}}_2 ) that must be added to 0.340 kg of water to reduce the vapor pressure by 2.86 torr at 40 ^circ ,{rm C} (P_{{rm H}_2{rm O}} at 4
Calculate the mass of H2O produced when 12.0 g of glucose is combusted in a container of oxygen with a volume of 1.3 L at a pressure of 2.2 atm and a temperature of 205 °C.
Vitamin C (L-ascorbic acid; MW = 176.0 g/mol) is a weak acid (pKa = 4.863). Suppose a 500.0 mg tablet is dissolved in water and titrated with 0.100 M NaOH. How many mL of NaOH are required to reach
Calculate the pH resulting from mixing 15.00 mL of 0.800 M HIO3 (pKa = 0.77) with 45.00 mL of 0.0200 M NaOH.
A robust first grader goes for swimming lessons three times a week, and he enjoys it thoroughly. Determine his dosage of amoxicillin in mg. per single dose.
The diameter of a neutral helium atom is about 1x10 pm.suppose that we could line up helium atoms side by side in contact with one another. approximately how many atoms would it take to make the dis
What mass (in grams) of water would he need to perspire in order to maintain his original temperature? (It takes 44.0 kJ to vaporize 1 mole of water.)
The heat of reaction for the combustion of cyclobutane, C4H8, is 650.3 kcal/mol. What is the heat of combustion for cyclobutane in kcal/gram?
A 0.831-g sample of SO3 is placed in a 1.00-L container and heated to 1100 K. The decomposes to SO2 and O2: 2SO3(g)>2SO2(g)+O2(g). At equilibrium the total pressure in the container is 1.300 atm.
Consider the cell prepared with 2.0 M Cd2+ and 0.45 M Zn2+ solutions:) Calculate the standard cell potential.
How many units would have been produced during the second quarter under Lean Production?
You have prepared a saturated solution of X at 20C using 27.0 g of water. How much more solute can be dissolved if the temperature is increased to 30 C?
The standard molar enthalpy of vaporization for water is 40.79 kJ/mol. What mass of steam is required to release 500. kJ of energy upon condensation? (Molar mass of water is 18.02 g/mol.)
When 28.6 kg of Fe2O3 react with 17.2 kg of CO and 6.3 kg of Fe are recovered, what is the percent yield for the reaction?
Calculate the concentration of each ion present in a solution that result from mixing 50 mL of a .20 M NaCLO3 solution with 25 ml of a .20 M Na2SO4. Assume that the volumes are additive.
The maximum pressure that can be developed for a certain fluid power cylinder is 15.0 MPa. Compute the required diameter for the piston if the cylinder must exert a force of 30 kN.
List the species, Cl-, NH3, or Br- in order of decreasing stability of the compounds or complexes that they can form with silver and explain your reasons.