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A sample of lead with an unknown mass cools from 82.0°C to 28.0°C. The metal releases 206.0 joules of energy as it cools. What is the mass of the sample of lead? (Hint: look up the specific heat of lead in the slides.)
Calculate the molality of a 20.0 per cent by weight aqueous solution of NH4Cl. (Molecular weight: NH4Cl = 53.5) (b) If this NH4Cl solution is assumed to be ideal and is completely dissociated into ions, calculate the vapor pressure of this solutio..
A student weighed a fuel cup for a bomb calorimetry experiment and obtained 10.3729 g. She then added a benzoic acid pellet and reweighed, finding 11.2872 g
When a mixture of 12.5g of acetylene (C2H2) and 12.5g of oxygen (O2) is ignited, the resultant combustion reaction produces CO2 and H2O
What is the half-life (in years) of 44Ti if a 1.0 ng sample decays initially at a rate of 4.8*10^3 disintegration s/s
The reaction between sulfur dioxide and oxygen is exothermic. 2 SO2 (g) + O2 (g) 2 SO3 (g) Which of the following factors will cause the equilibrium to be shifted to the right
Needed to synthesize the ester, butyl butanoate, which is responsible for the scent of the pineapple in the lab. Depict the skeletal structure of the indicated species below you would use to make yours cent.
draw the lewis dot structures for the following molecules:
Calculating the Moles of Aspirin, The molecular formula for aspirin is HC9H7O4, Calculate the molecular weight for aspirin
write a complete mechansim for the formation of 1-methylcyclohexeneby the acid-catalyzed dehydration of
Express b in terms of the mass m of each atom and the temperature T of the gas( and other constants), given that the Boltsmann factor in P(cx) pertains to the x- component of the kinetic energy of each atom in the gas.
What is the pH at the stoichiometric point (end point) for the titration of 50 ml of 0.20 M methyl amine CH3NH2 (aq) with 0.20 M perchloric acid HClO4(aq)? For methyl amine (CH3NH2), Kb = 3.6 x 10^-4.
If I add 0.495 g of solid calcium in a cup and of 100.0mL of deionized water. What is the inital moles of Ca in the cup
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