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An ice cube of mass 9.0 g at temperature 0°C is added to a cup of coffee, whose temperature is 85 °C and which contains 120 g of liquid. Assume the specific heat capacity of the coffee is the same as that of water. The heat of fusion of ice (the heat associated with ice melting) is 6.0 kJ/mol. What is the final temperature of the coffee after the ice melts
Nicotine is responsible for the addictive properties of tobacco. Assume Kb1= 1.05 x 10^-6 and Kb2= 1.32 x 10^-11. Determine the pH of a 0.00120 M solution of nicotine.
A student dissolves 7.39 g of and unknown protein in 0.286 l of water at 300k. She measures the osmotic pressure to be 3.932 x 10^-3 ATM.
Compute the net ATP molecules generated include ATP generated from oxidation of all cofactors when 1 molecule of fructose-6-phosphate is converted into 2 acetyl CoA molecules. Presume the glycerol-3-phosphate shuttle is used.
mass is obtained in the reaction, what mass of S2O3^2- was present initially, assuming the reaction went to completion? the density of the HSO3^- solution is 1.45 g/cm^3
A certain shade of blue has a frequency of 7.12 × 1014 Hz. What is the energy of exactly one photon of this light
100ml of a 0.4 mol/L acetic acid is mixed with 20ml of a 1.8 mol/L NaOH. Calculate the pH of this buffer (pka acetic acid = 4.76). What is the pH of 100mL of a solution made using 5 mL of 1 M Na2HPO4 and 5mL of NaH2PO4
How much energy is required to heat 10.0 g of ice from -50 to 50 degrees C. The heat of fusion of water is 6.01 kJ/mol and the molar heat capacity is 36.6 J/K mol for ice and 75.3 J/K mol for liquid water.
After carrying out the reaction, why does a precipitate (solid) form when you pour the reaction mixture on ice
A sample of neon gas used in a neon sign occupies a volume of 1.50 L at a pressure of 630 torr. Calculate the volume of the gas if the pressure in the glass tube of the sign is 793 torr.
Use Coulomb's law to calculate the ionization energy in kJ/mol of an atom composed of a proton and an electron separated by 203.00 pm
Problem- The freezing point of 0.0830 m aqueous acetic acid is -0.159?C. Acetic acid, HC2H3O2, is partially dissociated according to the equation: HC2H3O2 (aq) H^+^ (aq) +C2H3O2^-^ (aq). Calculate the percentage of HC2H3O2 molecules that are diss..
Determine the enthalpy change deltaH for the reaction at 298 K B. Determine deltaS surr for the reaction C. Determine deltaS sys for the reaction D. Determine deltaG for this reaction. Will this reaction be spontaneous
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