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A gas cylinder filled with nitrogen at standard temperature andpressure has a mass of 37.289g. The same container filled withCO2 at STP has a mass of 37.440g. When filled withan unknown gas at STP,
A mixture of gases collected over water at 14 degrees celcius has a total pressure of 0.981 atm and occupies 55 ml. How many grams of water escaped into the vapor state? Hint: What is the vapor pre
Calculate the molecular weight of urea, 180 grams of whichdissolve in 1500 grams of water to produce a solution having afreezing-point of -3.72 degrees Celsius.
Why is crossed aldol condensation between acetone and 1-propanalless synthetically useful than the crossed aldol condensationbetween actone and 2,2-dimethylproponal?
When 15.0g of fluorite (CaF2) reacts with excess sulfuric acid, hydrogen fluoride gas is collected at 744 torr and 25.5 degrees celcius. Solid calcium sulfate is the other product.
The change ininternal energy for the combustion of 1.0 mol of octane at apressure of 1.0 atm is 5084.3 kJ. If the change in enthalpy is5074.3 kJ, how much work is done during the combustion?
A 5.00g sample of liquid water at 25.0degree C is heated by adding 84.0J of energy. The specific heat of water is 4.28J/g*K. What is the final temp of the water in degree C?
331 mg of an unknown acid was titrated with 0.110 M sodium hydroxide. The equivalence point is at 25.00 mL. What is the molar mass of the unknown acid?
What is the concentration of hydroxide ion in a solution whose concentration of hydro-gen ion is 1.25 ×10-5 M? Would the solution be acidic or basic? explain.
If titrating 0.1461 g of dl-mandelic acid with 0.05 M sodium hydroxide solution, what would the titration curve look like? Mark end point and half titration point.
If a chemical reaction, A + B --> C + D, is endothermic, what is the sign of ΔH for the reaction? Would the temperature recorded in the calorimeter well for such a reaction increase or dec
How do you write the molecular & net ionic equation for thereaction that occurs when aqueous solutions of lead acetate(PB(C2H3O2)2) &calcium chloride (CaCl2) are combined?
Salinity is defined by ocenaographers asfollows: mass of dissolved salts/ mass of solution x 1000 suggest asimple way to determine the salinity of seawater sample in the laboratory.
Explain why the acetylation requires one mole of aceticanhydride per mole of phenetidine, despite the fact that aceticanhydride contains two acetyl groups. How is the by-productcontaining the second
For the thermal decomposition of nitrous oxide,2N2(g) -> 2N2(g) + O2(g),values of the parameters in the arrhenius equation areA=4.2x109s-1 and Ea=222 KJ/mol.
Suppose you want to do a physiological experiment that calls for apH 6.5 buffer. You find that the organism with which you areworking is not sensitive to the weak acid H2X(Ka1=2 x 10-2 and Ka2=5.0 x
Does a chemical reaction occur when a metal ion is placed in a flame and a color occurs? Explain. What is the difference between emission and absorption in spectroscopy?
In a test tube containing a precipitate ofPb(OH)2 in water, will the ions from the salt havea reasonable concentration? Explain.
A 1.6 g sample fo Co(NO3)2*6H2O isused to prepare the complex,[Co(NH3)4CO3]NO3. Assuming that all "other" reactants used in the synthesis of the complex are in excess, calculate the theoretical yie
What is the composition of the bubbles observed when the crude methyl benzoate product is washed with sodium bicarbonate? hint: consider the acidity of the solution (some HCl will be present) and t
Barium is reactive with water. In fact, all metals in this group are quite reactive with water. Can you names some other ones in order of their reactivity with water?
What is the molar mass of a gas which has a density of 1.16g.L-1. at STP ? If this gas is a hydrocarbon with 92.2%carbon by mass, what is the molecular formula of the gas ?
Does refining/isolation of nitrogen from liquid air usingfractional distillation cause any pollution or any environmental problems?
Methylamine CH3NH2, has a base dissociation constant of 3.7 x10-4. What is the conjugate acid of methlamine and what is its acid dissociation constant?
Rotational absorption lines from 1H35Cl gaswere found at the following wave numbers: 83.32, 104.13, 124.73,145.37, 165.89, 186.23, 206.60, 226.86 cm-1.