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A gas expands and does P-V work on the surroundings equal to 313 J. At the same time, it absorbs 135 J of heat from the surroundings. Calculate the change in energy of the gas.
Assume that the blue eyes in both families were caused by mutations in the same gene, and that there were no new mutations within the pedigrees
which one of the following represents the best method for the preparation of 3-chloro-3 ethylpentane?
The formaldehyde content of a pesticide preparation was determined by weighing .3124g of liquid sample into a flask containing 50ml of .0996M NaOH and 50mL of 3%H2O2. On heating, the following react
A sample of gas occupies a volume of 692 mL at 1.24 atm and 85 oC. Calculate the pressure of the gas if its volume is changed to 484 mL while its temperature is held constant.
Five constituionally isomeric monochlorides of molecular formula c6h13cl are formed (along with a mixture of dichlorides, trichlorides, etc.) What is the most reasonable structure for the starting a
Calculate the number of moles of an ideal gas if it has a pressure of 1.02 atm, a volume of 2.76 L, and a temperature of 222 oC. Use R = 0.0821 L-atm/mol-K for the value of the gas constant.
Titration of a .7439g sample of impure Na2B4O7 required 31.64mL of .1081M HCl. Express the results of this analysis in terms in percent
A mixture of gases contains 5.31 g of He, 2.91 g of SO2, and 5.62 g of Ne. If the total pressure of the mixture is 3.81 atm, what is the partial pressure of each component
Why do multicellular animals need a circulatory system, Fluid pressure is very low in the veins. Explain how bloodgets back to the heart
A mixture of gases contains 4.32 g of Ar, 7.88 g of BF3, and 4.86 g of N2. What is the partial pressure in atm of each component of this mixture if it is held in a 61.3-L vessel at 10.9 oC? Use R =
What would be the relative standard deviation in the molarity of the base if the standard deviation in the measurement of mass in a.) is .002g and this uncertainty limits the precision of calculatio
Calculate the rms (average) speed of PH3 atoms or molecules at 123 oC. Use R = 8.314 kg-m2/K-s2-mol for the value of the gas constant. The average speed of a PH3 atom/molecule at 123 oC is 539 m/s.
How would the research programs of the two schools have influenced their perceptions about the amount of genetic variation present in the wild?
Calculate the molar mass of the unknown gas. Remember that the faster the rate of effusion, the shorter the time required for effusion; that is, rate and time are inversely proportional.
If 1L of .15M NaOH is unprotected from mmol of CO2, what will be its new molarity when it is standardized agains a standard solution of HCl using
You've been experiencing acid indigestion lately, and you'd like a quick fix for the problem, what would you find had happened to the ionconcentrations of your stomach fluid
The boiling points of HCl and CO2 are nearly the same (-85 degrees C and -78 degrees C). Explain why CO2 can be removed from an aqueous solution by boiling briefly while essentially no HCl is lost e
what is the structure of an ester of 2-methylpropionic acid that has the molecular formula: C8H13ClO2 and 5 signals in its 1H NMR spectrum?
Calculate the mass in grams of copper initially present in the penny based on the concentration of copper in the sample, the total volume of the sample, the dilutions to the original stock, and the
Values for Ksp at O degrees C, 50 degrees C, and 100 degrees C are 1.14X10^-15, 5.47X10^-13, and 4.9X10^-14 respectively. Calculate the pH for a neutral solution at each of these temperatures.
Consider the titration of 30.0 ml of 0.048 M NH3 with 0.025M HCl. Calculate the pH after the following volumes of titrant have been added.
The side chain of the amino acid glutamic acid would tend toassociate with, the surface of a water soluble protein or interior of a water soluble protein, Oxidative phosphorylation is part of
Why are the standard reagents used in neutralization titrations generally strong acids and bases rather than weak acids and bases?
Compare in your mind 3 different liquids: pure ethanol, a 50% ethanol/water mixture and a 50 % ethanol/methanol mixture. Rank these three liquids in order of increasing Ptotal when each liquid is in