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Chlorine has two isoptopes, Cl-35 as well as Cl-37 which have masses 34.96885u and 36.96490u respectively. It's average atomic mass is 35.453u. Compute the isotopic abudance of each isotope.
Calculate the energy that must be transferred as heat to evaporate 1.00 kg of water at (a) 25 degrees celsius and (b) 100 degrees celsius
How much will the pH change? The pKa of acetic acid is 4.760.
An object weighs 1.2 pounds and has a volume of 14.6 in squared. What is the density of the object. Express the answer in g/mL
Nitrogen dioxide (NO2) cannot be obtained in a pure form in the gas phase because it exists as a mixture of NO2 and N2O4. At 25°C and 0.98 atm, the density of this gas mixture is 2.7 g/L.
A chemist prepares a sample of hydrogen bromide and finds that it occupies 252 mL at 70C and 464 Torr. What volume would it occupy at 0C at the same pressure.
Express the concentration of a .0560 M aqueous solution of flouride, F-, in mass percentage and in parts per million. Assume the density of the solution is 1.00g/mL.
a rigid container is filled with liquid acetone at 20 degrees C and 1 bar. through heat transfer at constant volume, a pressure of 100 bar is generated
A 2.30mL of seawater contains about 4.00x10^-10g of gold. The total volume of ocean water is about 1.50x10^21 L. Calculate the total mass of gold found in the worlds oceans in grams
Lead has melting point of 327 C, its specific heat is 0.13 J/ g*deg, and its molar enthalpy of fusion is 4.80 kj/mol. How much heat, kilojoules, will be required to heat a 500.0g sample of lead from 23.0 C to its melting point then melt it
What is the equilibrium constant for K2CrO4 and what is the equilibrium constant for K2Cr2O7?
Consider the malate dehydrogenase reaction from the citric acid cycle. Given the following concentrations, calculate the free energy change for this reaction at 37.0 °C (310 K). ?G°\' for the reaction is 29.7 kJ/mol.
q1. what is the mass number of an iron atom that has 28 neutrons?q2. calculate the number of neutrons of 239pu. q3.
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