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When 1 mol of Fe2O3(s) is formed by combustion of Fe(s)with O2(g), 824 kJ of heat is liberated. By this reaction, how many mol of Fe should be consumed in order to liberate 100. kcal of heat?
A quantity of 1.25 mole of an ideal gas at 328 K expands isothermally against a constant external pressure of 2.85 atm from 3.12 L to 11.85 L. Calculate the values of q, w, delta H, delta S system
A solution is made by mixing 12.0 g of NaOH and 75.0 mL of .200 M HNO3. Write a balanced equation for the reaction that occurs between the solutes. Calculate the concentration of each ion remaining in solution. Is the resultant soluiton acidic or ..
Water supply in a city is fluoridated by adding NaF. The preferred concentration of F- is 1.6ppm.calculate the amount of Naf in milligrams should be added per gallon (treated water) if the water supply is 0.2 ppm in F-?
Calculate the transmittance of 162-nm radiation through a sample of ethylene gas at 25 oC and 10 torr for a cell length of (a) 1.0 cm; (b) 10 cm.
An unknown amount of water is mixed with 300 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 51.7 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in uni..
If 4.00 g of the unknown compound contained 0.133 mol of C and 0.267 mol of H, how many moles of oxygen, O, were in the sample?
Your observations should reveal a difference in at least one property between sodium benzoate and benzoic acid. What property was that, and what observation will reveal the difference?
A 250.0-L cylinder contains 65.0% He(g) and 35.0% Kr(g) by mass at 25.0° C and 1.35 atm total pressure. What is the partial pressure of He in this container?
What would happen to the A450 value for a smaple which include : 1mL of 0.0025M Fe(NO3)3 + 1mL of 0.0025M KSCN + 5.0mL of 0.1M HNO3 if you accidentally added 5 drops of disodium hydrogen phosphate
How is HCl a base if it has no OH ions in is formula to omit when dissolved? Where does it's O come from
How many mL of a 0.136 M aqueous solution of aluminum bromide, AlBr3, must be taken to obtain 17.3 grams of the salt?
describe in detail the internal changes that occur within dental porcelain when firing porcelain jacket crowns and
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