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20 g of ice at 0 oC is added to 50 g of water at 30 oC. The container is insulated and has a water equivalent of 20g. Calculate the entropy change for the system and the surroundings. The heat of fusion of water is 6.02 kJ/mol; Cp (water)=4.184 J/K/g, Cp(ice)=2.094 J/K/g.
solution of an unknown acid has a ph=1.776. What is the value of acid dissociation constant?
What is the strongest base that may exist in water? What happens to stronger bases? (Use methoxide, CH3O1-, as an example.)
Consider the reaction: CaCO3(s)===CaO(s)+CO2(g) An equilibrium mixture of this reaction at a certain temperature was found to have [CO2] = 0.478M. What is the value of the equilibrium constant at this temperature
what is the actual amount of magnesium oxide produced when excess carbon dioxide reacts with 42.8 grams of magnesium metal?
Show the full mechanism of bromination for both 2,4-nitrophenol
predit the products of the reactions of phenylacetaldehyde,c6h5ch2cho,with the following reagents: 1) NaBH4 then H3O+ 2)aqueous acidic CrO3 3)NH2OH 4)CH3MgBr, then H3O+ 5) CH3OH, H+ catalyst
A rigid flask is initially filled with 4.00 atm of NO2(g) and no N2O4(g) at 100 C. After equilibrium is achieved, the pressure of NO2 is 1.56 atm.
the thermal equilibrium temperature of the metal sample plus water mixture is 24.6 *C. what is the specific heat of the metal?
A researcher suspects that the pressure gauge on a 49.9-L gas cylinder containing nitric oxide is broken. An empty gas cylinder weighs 135 lb. The weight of the partially full cylinder is 164.2 lb.
170mL of O2 gas is collected over water at 25 degrees C and the total pressure is 742 mm Hg. The vapor pressure of water is 23.8 mm Hg at this temperature. What would the volume of the dry gas be at STP? ( hint Daltons Law and Combination Law are ..
200 mL sample of lake water is contaminated with a single monoprotic acid. titrating this sample with a .005 M NaOH required 7.3 mL of the NaOH solution to reach the endpoint. what is the concentration of H in the lake
in the reaction P4+5O2->2P2O5, how many moles of oxygen are consumed each time 0.500 mole of P2O5 is formed?
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