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calculate the number of molecular impacts on 1 cm² of your eyeball each second in the...
Calculate the total number of molecular collisions that occur per second in 1 cm3 of air ( 80% N2 and 20% O2 by number ) at 1 atm and 298K. (No more information provided)
5.36 A tube, of inside diameter 1 cm, is coated with a solid that has a molecular weight of 80 and a vapor pressure of 100 mmHg at 25°C. Air at 25°C is pumped through the tube at 360 L/min. The tube is 20 cm long. The tube exit is at atmo- spheric pressure. a. What is the air pressure at the tube en- trance (mmHg)? b. What is the rate of mass loss of the solid, into the airstream...
Light rays that enter your eye are affected by the fluid that fills the eyeball, called the vitreous humor (Figure 1). When red light from a λ=633nm helium–neon laser enters your eye, its wavelength drops to 474 nm. Use this information to calculate the index of refraction of the vitreous humor and the speed and frequency of light passing through it. A) The newest laser pointers emit light with a wavelength of λ0=555nm in air. What is the wavelength of...
2. As shown in figure, an open beaker, 6 cm in height is filled with liquid benzene at 25°C to within 0.5 cm of the top (evaporated). A gentle breeze of dry air at 25°C and 1 atm is blown by a fan across the mouth of the beaker so that evaporated benzene is carried away by convection after it transfers through a stagnant air layer in the beaker. The vapor pressure of benzene at 25°C is 0.131 atm. The...
9. The density of air at 1.000 atm and 25 °C is 1.186 g/L. a) b) Calculate the average molecular mass of air. From this value, and assuming that air contains only molecular nitrogen and molecular oxygen gases, calculate the mass % of N2 and O2 in air.
The density of air at 1.000 atm and 25 °C is 1.186 g/L. 9. Calculate the average molecular mass of air. a) From this value, and assuming that air contains only molecular nitrogen and b) molecular oxygen gases, cal culate the mass % of N2 and O2 in air.
The molecular mass of helium is 4 g/mol, the Boltzmann’s constant is 1.38066 × 10−23 J/K, the universal gas constant is 8.31451 J/K · mol, and Avogadro’s number is 6.02214 × 1023 1/mol. Given: 1 atm = 101300 Pa. How many atoms of helium gas are required to fill a balloon to diameter 26 cm at 14◦C and 1.696 atm? What is the average kinetic energy of each helium atom? Answer in units of J. What is the RMS speed...
4 (20 Points) Calculate the number-average molecular weight and the weight average molecular weight of a polymer sample made of polystyrene with a repeat unit of (CH2- CH(CHs)) and composed of two types of chains. 60 percent of the chains have a degree of polymerization of 7,000 and the rest 50,000. Carbon has an atomic weight of 12 g/mol and hydrogen is 1 g/mol.
Calculate each of the following quantities in 0.180 mol of C6H14O. 1. Calculate the number of moles of C (nC). Express your answer with the appropriate units. 2. Calculate the number of moles of O (nO). Express your answer with the appropriate units. 3. Calculate the number of atoms of H (NH). Express the number of atoms numerically. 4. Calculate the number of atoms of C (NC). Express the number of atoms numerically.
Calculate the number-average molecular weight of a random nitrile rubber [poly(acrylonitrile-butadiene) copolymer] in which the fraction of butadiene repeat units is 0.32; assume that this concentration corresponds to a degree of polymerization of 2030. Calculate the molecular weight of the acrylonitrile repeat unit in g/mol. Part 2 Calculate the molecular weight of the butadiene repeat unit in g/mol. Part 3 Calculate the average molecular weight of the copolymer repeat unit in g/mol. Click here to access Table 4.5. m =...