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A lab rat weighs 265 grams and absorbs 1.67*10^13 beta particles eash with an energy of 2.2*10^13u. If relative biological effectiveness is .75 what is the dose? a)1.04*10^-2 sV b)1.3*10^-2 sV c)1.04*10^-5 sV d) 1.39*10^-5 sV e)6.23*10^-13 sV
Consider the following data. 2 Ca(s) + O2(g) 2 CaO(s) H = -1270.2 kJ C(s) + O2(g) CO2(g) H = -393.5 kJ CaO(s) + CO2(g) CaCO3(s) H = -178.3 kJ Use Hess's law to calculate H for the reaction below.
How long would it take for 1.50 mol of water at 100.0 C to be converted completely into steam if heat were added at a constant rate of 25.0 J/s
Why is acetanilide more reactive than methyl benzoate in a competetive nitration
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.
A solution is made by combining 15.0mL of 16.5M acetic acid with 5.52g of sodium acetate and diluting to a volume of 1.50L Calculate the pH
In combustion studies of the use of H2 as an alternative fuel, HO is sometimes formed in flames by the reaction
do not specify stereochemistry. (The absolute stereochemical configurations of chiral substances cannot be determined from the data.)
Calculate Ea. Express your answer using two significant figures Ea= kJ/mol Calculate A. Express your answer using one significant figure. A = M-1s-1
Consider the reaction Br2(g) 2 Br(g), which is endothermic as written. What would be the effect on the equilibrium position of decreasing the temperature
A gaseous mixture of O2 and Kr has a density of 1.102 g/L at 420 torr and 300. K. What is the mole percent O2 in the mixture?
The two electrodes Cr/Cr+3 and Sn/Sn+2 are combined to afford a spontaneous electrochemical reaction. The standard reduction potentials (volts) for Cr+3 and Sn+2 are -0.74 and -0.14, respectively. Calculate E° for this reaction.
Include activity coefficients in your solubility-product expression. The Ksp of Hg2I2 is 4.6× 10-29.
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