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A researcher studying the nutritional value of a new candy places a 4.20-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.71 °C. If the heat capacity of the calorimeter is 47.30 kJ·K-1, how many nutritional Calories are there per gram of the candy?
How many Valence electrons does a balanced atom of Sodium have? What is the net charge on each ion?
A 1.0 L sample of a gaseous compound of hydrogen, carbon, and nitrogen gave upon combustion 2.0 L of CO2, 3.5 L of H2O vapor, and 0.50 L of N2 (with all gas volumes measured at the same T and P). What is the empirical formula of the compound?
Cd2+, Co2+ is saturated with H2S at a pH of 3.00. Which metals form a sulfide solid? [H2S]sat=0.10 and Ka1= 1.3e-7 and Ka2=8.5e-14
the trunk remains undistrubed for 13,750 years what percentae of the original c-14 is still present ? ( half life of c-14 = 5730)
What is H in kJ for the process of freezing a 28.9 g sample of liquid silver at its normal melting point of 961 oC.
An unknown gas composed of homonuclear diatomic molecules (its structure is X2) diffuses at a rate that is 1.07 times that of O2 at the same temperature. What is the identity of the unknown gas
what is the half life for this reaction B) how long will it take for the concentration of SO2Cl2 to decrease to 25 percent of its initial concentration C) if the inital concentration of SO2Cl2 is 1.00 M
what is the PKa for the acid HA if a solution of 0.65 m and 0.85 M NaA has a PH 4.75
Calculate the equilibrium constant kc for a reaction occuring at a temp 0f -19 degree C and when delta G of 1.6 KJ/mol(use R =8.314 J/mol and 273 for kelvin conversion)
For the reaction 2CH4(g) +3Cl2(g) -> 2CHCl3(l) + 3H2(g), the standard enthaly of change of reaction = -118.6KJ. The standard enthalpy of change of reaction
Treatment with cyanogen bromide, which cleaves at M, resulted in two fragments: a pentapeptide containing two K residues and a tripeptide containing V, G, and A. (The residues are not listed in any particular order.)
The air is cooled as the water evaporates. How much water must be evaporated to cool the air in a room of dimensions 4.0 m x 5.0 m x 3.0 m by 20. C? Assume that the enthalpy of vaporization of water is the same as it is at 25 c.
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