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A student completed the experiment but found that the total amount of material recovered weighed more than the the original sample. What is most likely source of error and how it may corrected? B) A student found that the mass of the napthalene collected was less than the mass determined by difference. What would account for the smaller amount of napthalene collected? C.) Mothballs in a closet gradually disappear over time. What happens to this material? D.) In 100g. of sweet peas, there are 14.5g carbohydrates, 5.7g sugars, 5.1g dietary fiber, 5.4g protein and 0.4g fat. Calculate the percent composition of these components.
A substance has a molar extinction coefficient of 2.4x104cm-1M-1 and an absorbance of 0.10 What is the concentration of this substance in a cuvette with a 1.0 cm path length.
This mixture has density of 1.391g/L and occupies a volume four times as that of pure hydrocarbon. Determine the molecular formula of the hydrocarbon.
The standard deviation of the analytical method was determined to be +/-2.3%. What is the standard deviation overall? And in order to reduce the overall standard deviation to +/- 5.0%
If the pressure of gaseious chloroform in a flask is 195 mm Hg at 25 degrees celsius and its density is 1.25 g/l, what is the molar mass of chloroform?
Assume that a particular reaction evolves 239 kJ of heat and that 27 kJ of PV work is gained by the system. what are the values of delta H and delta E? Assume that a particular reaction evolves 239 kJ of heat and that 27 kJ of PV work is gained..
A certain substance has a heat of vaporization of 69.66 kJ/mol. At what Kelvin temperature will the vapor pressure be 4.50 times higher than
what concentration in ppm would it constitute? The effective volume of the earth's atmosphere is about 4.2 billion km^3, and take the average pressure to be 550 mm Hg and the average temperature to be -10 degrees C. The molar mass of air is 29 g/m..
Balance the equation and determine the mass in grams of chlorine that would be formed if 25 grams of PCl3 (molecular mass = 137.32 g/mol) decompose.
what volume of oxygen gas will be collected if a 5gram sample of potassium permanganate decomposers at 25 degrees celcius and 1 atmospheric pressure?
Give the balanced thermochemical equation for the following reactions. show the correct physical state in each equation.
Given that the atomic mass of carbon is given as 12.0107 g/mol, what are the approximate relative abundances of the two isotopes 12C and 13C?
The crossed aldol condensation of acetaldehyde with benzaldehyde is aided by the fact that benzaldehyde bears no α-protons. However, a possible competitive reaction is the “selfcondensation†of two molecules of acetaldehyde.
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