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An evaluation of R was performed, following the procedure described in this module. The barometric pressure was 736 torr, the temperature was 295 K, and the volume of hydrogen gas collected was 35.6 mL. The calculated value of R was 82.1mL atm K-1 mol-1.
1) How many grams of magnesium metal were used?
2) If the vapor pressure of water had not been taken into account, what would have been the calculated value of R?
3) If the syringe volume had been incorrectly read, giving a calculated system volume of 25.6 mL, what would have been the percent error in the calculated value of R?
Calculate the mass percent of a solution that is prepared by adding 40.0 g of rm NaOH to 408 g of {rm H_2O}.
Carbon NMR has only the following peaks: 29.8, 36.1 and 206.8 ppm. Propose a structure of this compound and explain splitting pattern and the ratio
If the equilibrium constant for a one electron redox reaction at 298k is 8.7*10^4, calculate the corresponding change in G and Ecell
a student collects 31.8 mL of argon gas at a temperature of 21 Celsius and a pressure of 755 mmHg. What is the volume of argon at STP?
Consider the following equation: CO + 2 H2 → CH3OH ?H rxn = -128 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 8.08 g H2.
A 1.90 mole quantity of NOCl was initially in a 1.50 L reaction chamber at 400°C. After equilibrium was established, it was found that 36.0 percent of the NOCl had dissociated.
In the experiment aniline and acetic anhydride are reacted to form acetanilide, how do you calculate the theoretical yield of acetanilide?
An unknown mass of each of sand, initially at 24.0, absorbs 1970 of heat. The final temperature is 62.2 degrees C. Find the mass of sand.
The solubility of a gas in H2O at a temperature of 25 °C and a pressure of 1.2 atm is 0.042 M. What will the solubility of the same gas be in H2O at the same temperature at 3.4 atm.
Determine the wavelength, of an alpha particle with a(KE) kinetic energy of 8.0 10-13 Joules
Using a sample of water with a mass of 46.0 grams at a temperature of -58. Degree Celsius calculates how many Joules of energy (E) are necessary to heat the ice to 0 degree Celsius. Specific heat of ice= 2.1 J/g C).
Calculate the pH of the resulting solution at each of the specified points in the titration. Initially: pH of HCl
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