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It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm3). What is the density of talc?
Calculate the minimum number of grams of propane that must be combusted to provide the energy necessary to convert 5.35 of ice at -21.5 to liquid water at 76.0.
The solubility of oxygen in lakes high in the Rocky Mountains is affected by the altitude. If the solubility of O2 from the air is 2.67 × 10-4 M at sea level and 25°C, what is the solubil
What is the name to represent the Electronic geometry of C2F2 and also how do you draw a diagram of the actual shape? What is the name to represent the actual shape?
If 25.0 mL AgNO3 of is needed to precipitate all the Cl- ions in a 0.785 mg sample of KCl (forming AgCl), what is the molarity of the AgNO3 solution?
Calculate the mass of propylene glycol that must be added to 0.500 kg of water to reduce the vapor pressure by 4.60 torr at 40 degrees celcius?
Which of the following conceps best describes the reason that atoms are larger and electron energies are weaker as you go down the periodictable?
The decomposition of N2O5 in solution in carbon tetrachloride proceeds via the reaction 2 N2O5 (soln) → 4 NO2 (soln) + O2 (soln) The reaction is first order and has a rate constant of 4
The density of a certain aqueous solution is 1.17g/ml, and the solution is 3.57% by mass NaOH. How many ml of this solution would you need to use in order to prepare 100.0ml of 0.150M NaOH solution
The brown gas NO2 and the colorless gas N2O4 exist in equilibrium. In an experiment 0.625 mole of N2O4 was introduced into a 5.00 L vessel and was allowed to decompose until equilibrium was reached.
Calculate the concentration of SO2(ppm) that must be reached in polluted air (in ppm) if the dissolved gas is to produce a pH of 3.2 in raindrops without any oxidation of the gas.
How many pounds of CO2 are produced from the complete combustion of 1.00 gal of gasoline? Assume that gasoline has the formula C8H18 and has a density of 0.703g/mL.
An isolated quantity of an ideal gas at 294.2 K has a volume of 20.46 L at a pressure of 1.18 atm. What is the pressure of this gas sample when the volume is multiplied by four and the absolute tem
A 2.16-L sample of oxygen is collected at 99.6 kpa and 305k. If the pressure increases to 122.8 kpa and the temperature drops to 285k, what volume will the oxygen occupy?
What is the wavelength of a light ray if its frequency is 4.64 x 1014 s-1? Please put your answer in units of nanometers (nm).
What is the final gas volume if 0.10 mol He(g) is added to the balloon and the temperature is then raised to 92.0 celsius while the pressure and amount of gas are held constant?
What is the freeenergy change for the equilibrium between hydrogen iodide, hydrogen, and and iodine at 453°? I Kc=0.020
A bag of potato chips contains 595 mL of air at 35°C and a pressure of 765 mmHg. Assuming the bag does not break, what will its volume be at the top of the mountain where the pressure is 432 mmH
If the temperature in the laboratory is 24.5oC and the atmospheric pressure is 1.02 atm, what volume would be occupied by the carbon dioxide produced in this reaction (in cm3)?
What color is the universal indicator when a double replacement reaction occurs with HCl and NaOH. The HCl turns the indicator red and the NaOH turns the indicator purple.
Calculate the amount of energy needed in calories to heat 145 g of water from 22.3 degrees celsius to 75.0 degrees celsius. (water in j/g degree celsius = 4.184, cal/ g degree celsius = 1)
A sample of toothpaste was analyzed for its fluoride content by treating a 250 mg sample with an ionic strength buffer to extract F- followed by dilution to 100.0 mL.
one mole of silicon si has a mass of 28.086 g, and one mole of carbon has a mass of 12.011 g. what is the massof one mole of silicon carbide ?
The normal characteristics stretching frequency of the carbonyl group of a ketone in the IR spectrum is about 1720 cm-1. Pick out the carbonyl stretching frequency of dibenzalacetone in Fig.37.6. Why
What would the molar concentration of the tree sap have to be to achieve this pressure on a day when the temperature is 35?