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On combustion 2.4 gram of a compound of carbon, hydrogen and oxygen gave 3.52 gram of CO2 and 1.44g of H2O. The molecular mass of the compound was found to be 60 amu.
If the sealed-tube manometer shown below had a height difference of 20.5 inches between the mercury levels, what is the pressure in the flask in torr and atmospheres?
In a experiment, you fill a 250 mL Erlenmeyer flask with the vapor. Why must the volume of the flask be determined by filling it with water? (Consider: just because a flask is labeled as a "250mL fl
If electricity of sufficient voltage is passed into a solution of potassium iodide in water, a reaction takes place in which elemental hydrogen gas and elemental iodine are produced, leaving a solu
Hemoglobin contains .33% Fe by mass. A .200 g sample of hemoglobin is dissolved in water to give 10.0 ml of solution, which has an osmotic pressure of 5.5 torr at 25.0 degrees C. How many moles of
Explain why, in the base-catalyzed halogenation of acetone, the second and third halogenations occur on the same carbon as the first, and not the carbon of the other methyl group??
Evaluate Zeff for a valence electron in the elements Li through Ne and use the result to explain the observed trend in the first ionization energy of these elements.
Aniline (C6H5NH2, Kb = 4.3 x 10^-10) is a weak base used in the manufacture of dyes. Calculate the value of Kn for neautralization of aniline by vitamin C (ascorbic acid, C6H8O6, Ka = 8.0 x 10^-5).
How many mL of unknown "X" (density = 0.79 g/mL) needs to be dissolved in 50.0 g of water (Kb=0.512) to make the boiling point of the resulting solution to be 104.5 degree celsius if when unknown "X
Hemoglobin contains 0.33% Fe by mass. A 0.200 g of sample is dissolved in water to give 10.0ml of solution, which has an osmotic pressure of 5.5 torr at 25.0 degree celsius. How many moles of Fe at
Natural gas is primarily methane, CH4, and is used to heat homes. A typical home is approximately 2000 ft2 and the ceilings are 8 ft high. The following data may be helpful:
A 1.719 g sample of a CaCO3 mixture is thermally decomposed, evolving CO2. After the reaction, the mixture has a mass of 1.048 g. How many grams and moles of CO2 gas are evolved?
Make a rough plot of pH versus milliliters of acid added for the titration of 50.0 mL of 1.0 M NaOH with 1.0 M HCl. Indicate the pH at the following points, and tell how many milliliters of acids a
What data would be required to determine the absolute entropy of O2 at STP? After the data is acquired what calculations would be necessary to get the result?
A mixture containing only BaO and CaO weighs 2.00g. The oxides are converted to the corresponding mixed sulfates, which weigh 4.00g. Calculate the weight percent Ba and Ca in the original mixture.
The solubility of aspirin in ethanol is approximately 40g/100mL at room temperature. If you had a 100% yield how many milliliters of ethanol would you need to dissolve your product for the recrysta
How much oxygen is required to support the aerobic biodegradation of the BOD5 material in a storm water + sewage overflow situation that involves a 24 h overflow of 2 500 gallons/hour into a receivi
The conversion of diamond to graphite is a thermodynamically favorable process. Suggest a reason why diamond does not change to graphite spontaneously.
The heat capacity of iron is 0.449 J/g·K. A blacksmith is hammering a 261 g horseshoe that has been heated to 1200 K. To cool the horseshoe, the blacksmith tosses it into a bucket containing
What is the maximum concentration of iodide ions that may be in solution to achieve the best separation possible?
How many grams of sodium sulfate will be formed if you start with 200grams of sodium hydroxide and you have an excess of sulfuric acid?
Sodium bicarbonate is often used as an antacid to neutralize excess hydrochloric acid in an upset stomach. How much hydrochloric acid in grams can be neutralized by 3.5 g of sodium bicarbonate?
The principal anion and cation in Lake Huron are hydrogen carbonate and calcium. The concentration of hydrogen carbonate is approximately 1.05 mmol/L.
Draw a diagram on the line below which shows 2.5 transverse waves. Measure the line and calculate the wavelength of a single wave in centimeters.
At 1000 K, the total equilibrium vapor pressure over liquid bismuth metal is 4.84 x 10-5 atm. It is known from mass spectrometric experiments that the vapor phase contains both atomic, Bi(g), and d