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(a) Calculate the enthalpy change (in J) when a 4.08 g sample of water at 26.4 °C and 1 atm is frozen to ice at -20.4°C and 1 atm.
(b) Calculate the enthalpy change (in J) when a 7.45 g sample of water at 48.5°C and 1 atm is converted to vapor at 139.3°C and 1 atm.
Stripping voltammetry is a trace electrochemical technique in which the current is linearly proportional to concentration. A solution of 1.0x10-7 M Pb(II) gave a current of 0.139 mA.
The ionization constants for sulfurous acid are Ka1 = 1.4*10^-2 and Ka2 = 6.3 * 10^-8. Species that need to be calculated (Molarity):
when a mixture at 273 K is heated to 473 K, how many different chemical changes occur? How many physical changes occur?
What pH is needed such that the maximum [Mg^2+] is solution is 2x10^-4M given the equilibrium: Mg(OH)2(s) Mg^(2+) + 2OH^- also pK(sp)=8.3
Calculate the pH of 1.00 L of the buffer 1.01M CH3COONa/1.01M Ch3COOH before and after the addition of the following species. (Assume there is no change in volume). (a) pH of starting buffer:
odium carbonate (Na2CO3) can be produced by heating sodium bicarbonate (NaHCO3). A student heats 5.128 g sodium bicarbonate to completely decompose the sample to sodium carbonate.
What would happen to the solubility of potassium chloride in water as the water temperature increased from 25 degrees celsius to 100 degrees celsius?
one mole of calcium carbonate reacts with ammonia to produce cacn2 and liquid water. the reaction absorbs 90.1 kj of
In the presence of Mn2+(aq), the reaction is first order in [Ce4+] and first order in [Mn2+]. Based on this which of the three steps in this mechanism is the rate limiting step. Why.
If the pressure exerted by ozone, in the stratosphere is 3.0*10^-3 atm and the temperature is 253 K, how many ozone molecules are in a liter?
You are to prepare 250 grams of 7.00% sodium carbonate solution. How many grams of sodium carbonate and how many mL of water do you use?
Give the formula of a product derived from the first-named substance that may be formed in the following reactions. Note, in the example that any lower oxidation state compound is possible
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