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A sample of iron has a mass of 257.0 lb and a volume of 0.523 ft3. What is its specific gravity? and What are the units of specific gravity?
The giant muscle protein titin is a roughly 30,000 amino acid long filament which plays a number of important roles in muscle contraction and elasticity. The I-band region of titin, largely composed of immunoglobulin-like (Ig) domains, is believed to be responsible for the molecule's extensibility and passive elasticity. The Ig domains are observed to unfold one by one; using molecular force microscopy, the force needed to unfold a single titin domain can be measured. Single domains unfold at an applied force of 1000 pN, and extend by a length of 26 nm. Interestingly, the domains don't refold until the applied force is lowered, to about 100 pN. (a)What is the work done in unfolding a single titin domain, per molecule? (b)!What is the energy of unfolding per mole? (c) If a single folding/unfolding cycle is done on the molecule, what is the net work done on the system? If the system is kept at constant temperature, what becomes of the energy in this work?
Considering the given equation 2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O in which The combustion of octane produces carbon dioxide and water , determine the mass of water.
Write the expression for the equilibrium constant, Kb, for methylamine also compute the molar concentration of OH- in the 50.0 mL sample of the CH 3 NH 2 solution.
Nitrosyl bromide, NOBr, is 34 percent dissociated at 25 deg. C and the total pressure is 0.25 atm. Calculate kp and kc for the dissociation.
If the gas was not pure butane but 10 mole percent propane and 90 mole percent butane then determine how would the MW value be affected?
If the methane contained in 2.00 L of a saturated solution at 25 degrees C was extracted and placed under STP conditions, what volume would it occupy.
A 2.32 L balloon contains helium at 1.00 atm and 25°C. How many grams of helium are contained in the balloon.
Calculate the pH of each of the following solutions. (a) 0.115 M HONH2 (Kb = 1.1 10-8)
how many grams of sucrose C12H22O11 must be added to 522g of water to give a solution a vapor pressure 2.0mmHg less than that of pure water at 20 degrees celsius
Calculate the number of moles of Cl atoms in 1.20×1024 of magnesium chloride, MgCl2.
Using the same sample of gas ( = 275 , = 43 ), we wish to change the pressure to 2750 with no accompanying change in volume or amount of gas.
A gas measures 180.0 mL at 87.0°C and 800.0 mm. Find its volume at standard temperature and 800.0 mm of pressure.
You have 16 electrons, 16 protons, and 16 neutrons. You can combine them to make 8 Helium (He-4) atoms, 4 beryllium atoms (Be-8), 2 oxygen atoms (O-16), or one sulfur atom (S-32).
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