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A 4.98 g sample of aniline C6H5NH2, molar mass = 93.13 g/mol was combusted in a bomb calorimeter with a heat capacity of 4.25 kJ/°C. Explain if the temperature rose from 29.5°C to 69.8°C, find out the value of H°comb for aniline.
A voltaic cell consists of a Zn/Zn2+ half-cell and a Ni/Ni2+ half-cell at 25 . The initial concentrations of Ni2 and Zn2 are 1.80 and 0.130 , respectively.
Give the corresponding atomic orbital designations (that is 1s, 3p, and so on) for electrons with the following sets of quantum numbers: 4,2, -1, -1/2
In what ways may the rotational and vibrational spectra of molecules change as a result of isotopic substitution
Raidum-226 (atomic mass=226.025402 amu) decays to radon-224 (a radioactive gas) with a half-life of 1.6 x 10^3 year. What volume of radon gas a (25 degrees C and 1.0 atm) is produced by 1.0 g of radium in 5.0 days
Explain A 30.1-g sample of Ne gas exerts a certain pressure in a container of fixed volume. Define what mass of Ar is needed to exert half the pressure at the same conditions of volume and temperature
What is the molarity of an HCl solution if 23.3 mL of the solution is required to react with .266 g of Na2CO3
A student measures 0.2452 g of a monoprotic solid acid, and dissolves the solid in water to make 100.0 mL of solution. The entire solution is titrated to a phenolphthalein endpoint with 45.09 mL of 0.1752 M KOH.
A Geiger counter is placed 1cm from a radioactive spill and gives a reading of 12,000 cpm. At what distance is the intensity of radiation 40 cpm
A 155 mL sample of rainwater is titrated using 0.0095 M NaOH solution. If 4.8 mL of the NaOH solution was required to reach the endpoint, what was the pH of the rainwater?
Describe the most likely effect of temperature, catalyst loading, and concentration on the rate of a diazo coupling reaction.
what is the function of the baso4 solution as a traditional method of measuring a knife wound in a homicide victims
A reaction has a rate constant of 0.00117 s^-1 at 400 k and 0.689s^-1 at 450 k.1- Calculate the activation energy (Ea) and the pre- exponential factor (A) for this reaction. 2- what is the value of the rate constant at 425k
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