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The initial temperature of a 344 g sample of iron is 18.2 deg C. If the sample absorbs 2.25 kJof energy as heat, what is its final temperature
typically when a person coughs he or she first inhales about 2.40 l of air at 1.00 rm atm and 25 circ rm c. the
Magnesium carbonate has a ksp value of 6.80×10?6 . What happens when magnesium and carbonate solutions are mixed to give 2.50×10?3 M Mg^2+ and 2.00×10?3 MCO3^2-
the water for the pan is not saturated with CO2. Will the reported percent CaCO3 in the original sample be too high, too low, or unaffected? Explain
KCL,KCLO3, and MnO2 having a total wight of 23.584 was jeated tp decompose the KCLO3. After heating, the mass was found to be 22.347g. how many moles of oxygen gas was evolved.
Draw the conj acid of this base and use its structure to explain why it is so basic (resonance forms may help). The pKa of the conj acid is about 26. What is the pKb of the free base?
Calculate the potential developed by a voltaic cell using the following reaction if all dissolved species are 0.025 M: 2 Fe2+ (aq) + H2O2 (aq) + 2 H+ (aq) ? 2 Fe3+ (aq) + 2 H2O (l)
what mass of magnesium will react wait a 500.0mL container of oxygen at 150.0 degrees Celsius at 70.0 kPa?
If a student starts with 615g of Co(NO3)2 and obtains a 57.3% yield of CoS, what mass of CoS is isolated? Co(NO3)2 +K2S ---> CoS + 2KNO3
Arrange the following ionic compounds in order of decreasing amount of energy released in lattice formation:
Estimate the pH at the equivalence point of an HOAc solution if 25.5 mL of this solution required 37.5 mL of 0.175 M NaOH to reach the equivalence point (Ka = 1.8 x 10-5).
A solution contains 10.90g of unknown compound dissolved in 50.0mL of water. (Assume a density of 1.00 g/mL for water.) The freezing point of the solution is -6.53C. What is the molecular formula of the compound
What is the molar ratio of initiator to sulfuryl chloride in the procedure? Why is so little initiator needed relative to the amount of chlorinating agent used
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