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A. Write a net ionic equation . B- for the reaction in part a, write the equilibrium constant from a consideration of Kb and Kw. C- calculate the h3o^+ for a 0.45 M nh4cl solution . D- calculate the
why does one begin a column elution with non polar solvents and progress to more and more polar solvents
In temperature dependance of reaction rates, if you use R=8.314 J/molxK, what should the units be for Ea in the absence of conversions
When performing extractions it is often better to do multiple extractions rather than one large volume extraction. suppose you have 100mg of a sample dissolved in 0.6ml of water.
benzoic acid and dissolve it in 1ml of diethyl ether. this is then extracted with 1 ml of water. the ether is removed, dried with sodium sulfate and ether evaporated yielding 30 mg of benzoic acid.
The observed temperature increase is 2.64 °C. If the heat capacity of the calorimeter is 32.30 kJ·K-1, how many nutritional Calories are there per gram of the candy
If energy obtained from burning 1.23 pounds of butane (feul value is 10.85 kcal/g) is used to heat 126.5 kg of water at an initial temperature of 20.7 degrees C, what is the final temperature
A researcher working on a batch of a ceramic material tested two sets of samples for fracture strength. For one set of samples the specimens were tensile bars with a 10x10x100 mm^3 tensile gauge sec
what are the equilibrium concentration of N2 C. If the initial concentration of NO is 0.177M , what are the equilibrium concentration of O2
How would I calculate the theoretical enthalpy of reaction between HCl + NaOH -> H2O + NaCl
What is the mass percent of Ca in the alloy. The unbalanced equations are given below. (Hint: Let x = mass of Ca in the alloy in grams
85.50 mL of 0.0815 M sodium hydroxide is reacted with 8.15 g oxalic acid as shown in the reaction below. What mass of the excess reactant remains after the reaction is complete
Chlorine can be generated by heating together calcium hypochlorite and hydrochloric acid. Calcium chloride and water are also formed.
How much concentrated hydrobromic acid solution (48.0% HBr by mass, d = 1.52 g/mL), in milliliters, is required to produce 10.0 L of 0.185 M HBr
A gas mixture with a total pressure of 750 mmHg contains each of the following gases at the indicated partial pressures: CO2, 253 mmHg ; Ar , 133 mmHg; and 02, 166 mmHg . The mixture also contains h
Use the molar volume of a gas at STP to determine the volume (in L) occupied by 10.5 g of neon at STP.
Aerosol cans carry clear warnings against incineration because of the high pressures that can develop upon heating. Suppose that a can contains a residual amount of gas at a pressure of 770 mmHg and
What is the temperature of 0.46 mol of gas at a pressure of 1.3 atm and a volume of 11.7 L ? Express your answer using two significant figures.
The thermal decomposition of 1.6608 grams of MgSO4 x H20 produces 1.4446 grams of a product in a well behaved reaction. There are two possibilites
A syringe containing 1.42 mL of oxygen gas is cooled from 99.7 C to 0.6 C. What is the final volume of oxygen gas
A sample of gas has an initial volume of 2.8 L at a pressure of 753 mmHg .If the volume of the gas is increased to 3.6 L, what will the pressure be
A gaseous mixture of O2 and N2 contains 40.8 % nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 625 mmHg ? Express you answer numerically in millimete
At standard temperature and pressure (0 C and 1.00 atm ), 1.00 mol of an ideal gas occupies a volume of 22.4 L . What volume would the same amount of gas occupy at the same pressure and 35 C ? Expre
The pressure inside a hydrogen-filled container was 2.10 atm at 21 C . What would the pressure be if the container was heated to 85 C
About how many gallons of CO2 are produced by an incandescent 60-W lightbulb burning for an hour