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How many calories are needed to heat 45g of iron from 14 degrees celsius to 47 degrees celsius? (specific heat = 0.11 cal/g degrees celsius)
calculate the final volume. A volume of 3.55 L of oxygen at 25 °C and 95 kPa is brought back to normal conditions (STP).
if 2.50 mol of copper ii and 5.50 mol of silver nitrate are available to react by single replacement. what is the
Students in the lab place some sodium chloride in the beaker and remassed it to obtain a mass of 73.25 grams using a digital balance. Find the mass of salt in the beaker.
A 2.5 L helium balloon is filled at a florist's shop. If the temperature inside the shop is 68°F, what volume will the helium occupy after being left in an automobile at ?5°F in the parking lot for the day
Describe the experiment(s) (as necessary), observations (as necessary), and results (as necessary) which would allow you to distinguish
The heat of solution of ammonium chloride is 15.2 kJ/mol. If a 6.323 g sample of NH4Cl is added to 65.0 mL of water in a calorimeter at 24.5°C, what is the minimum temperature reached by the solution?
A solution which is 0.10 m in NaCl(aq) has the same equilibrium vapor pressure as a solution which is 0.10 m CaCl2(aq)
The stock solution is 500 ?g/mL and you want to obtain a final concentration of 1?M. What volume of the stock solution do you need to make 10 milliliters of the 1 ?M solution? Also: What is the molar mass of PMA?
The solubility of N2 in blood at 37°C and at a partial pressure of 0.80 atm is 5.6 10-4 mol/L. A deep-sea diver breathes compressed air with the partial pressure of N2 equal to 3.6 atm.
The Chemistry of Nicotine, Nicotine, a component of tobacco, is composed of C, H, and N. A 5.250-mg sample of nicotine was combusted producing 14.242 mg of CO2 and 4.083 mg of H2O
How are excess sulfuric acid and the excess methanol removed from the crude ester after the reaction has been completed. Why was 5% NaHCO3 used in the extraction. What would happen if 5% NaOH had been used
Carbonate buffers are significant in regulating PH of blood at 7.40. Calculate the concentration of Carbon dioxide in a 0.200M NaHCO3 at PH=7.40.
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