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A pipet delivers 10.5, 10.3, 10.9 and 10.7 ml. (a)find the mean volume and deviation from the mean for each and calculate the average deviation from the mean. (b) calculate the relative deviation (in %) for this set of data.
You mix 1.0 mL of 0.50 M of Cu(NO3)2 with 6.0 mL of 0.50 KI, and collect the dry CuI precipitate. How many moles of CuI precipitate are expected from Cu(NO3)2
A local radio station can be tuned in by dialing your radio to a frequency of 101.5 MHz. Calculate the energy of the wave.
prepare 3.9L of a HCN/NaCN buffer that has a pH of 9.70 and an osmotic pressure of 1.27atm at 298K. What masses of HCN and NaCN should you use to prepare the buffer
The following reaction was monitored by measuring the partial pressure of oxygen. The pressure was measured at 25 degrees Celsius.
Calculate the amount of heat liberated (in kJ) from 383 g of mercury when it cools from 61.0°C to 11.0°C.
Calculate the number of grams necessary to prepare 50. ml of 0.45 M NaCO2H. Calculate its pH.
A sample of hydrogen gas occupies 15.8 L at STP. How many moles of the gas are present?
A colorless unknown substance is spotted on a TLC plate and developed in the correct solvent. The spots do not appear when visualization with a UV lamp or iodine vapors is attempted
What is the pressure of the water vapor at a temperature of 250.0 degreee Celcius.
what is reduced and what is oxidized in this chemical equation: Zn+2HCl yields ZnCl2+H2
A mixture of O2, CO2, and N2 has a total pressure of 762. torr. In this mixture the partial pressure of O2 is 112. torr and the partial pressure of CO2 is 185. torr. What is the partial pressure of the N2 (in torr)?
A chemical reaction has ?G° = 10.0 kJ and ?S° = 50.0 J/K. Calculate ?H° for this reaction at 25°C. Could this reaction ever be spontaneous? Explain your answer please.
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