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an athelete is given 100 g glucose of energy equivalent to 1560 kj. He uses 50 % of this gained energy in an event . in order to avoid storage of energy in body . calculate the weight of water he would need to perspire . enthalpy of H2O for evaporation is 44 kj /mol
A solution made by dissolving 14.2 g of an unknown compound in 100.0 g of water has a freezing point of -0.771 °C. If the Kf for water is 1.86 °C/m
what is the molarity of a sodium hydroxide solution if 34.85 mL of the soution neutralizes 1.883 grams of pure KHP?
Two liquids, and , have vapor pressures at a given temperature of 24 and 36 , respectively. We prepare solutions of and at a given temperature and measure the total pressures above the solutions. We obtain the following data
Problem- What mass of potassium hydrogen sulfate is required to make 300. mL of a solution with a pH of 2.76. (The Ka of HSO4 Ka = 0.012.)
Problem- Estimate the total work that can be obtained by combusting butane (C4H10) at 2700K. (assume liquid water is produced). State other assumptions.
the solution diluted in half by water ( 1mL of X and 1mL of H2O) has an absorbance at 425 nm of 0.8 and a molar extinction coefficient of 1.5 x 10^3 M^-1 cm^-1. what is the molar concentration of the original solution of X
calculate the ph of a solution that is prepared by mixing 2.16 grams of propanoic acid, CH3CH2COOH, and 0.56 grams of NaOH in enough water
Draw two molecules that are diastereomers and calculate the energy of each. Then draw two molecules that are enantiomers and calculate the energy of each.
A radioactive isotope has an activity of 8.42×104 Bq initially. After 3.65 hours the activity is 6.57×104 Bq.What is the half-life of the isotope? What is the activity after an additional 3.65 hours?
If this codon is mutated to the sequence 5'-UUG-3' what is the expected consequence for the cell
Problem- The standard free energy of activation of one reaction A is 94.80 kJ mol-1. The standard free energy of activation of another reaction B is 78.50 kJ mol-1. Assume a temperature of 298 K and 1M concentration. By what factor is one reaction..
Based on the values of the standard reduction potentials, predict what happens when adding and write the relevant equations. copper to a 1 M solution of nitric acid zinc to a 1 M solution copper to a 1 M solution of hydrochloric acid zinc to a 1 M..
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