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28.96 g / mol This is a fun question. According to table 5.1 on page 155 of Atmospheric Science: An Introductory Survey By John M. Wallace, Peter V. Hobbs (table can be seen here on Google Books) dry air is composed of: Nitrogen: 78.084% Oxygen: 20.946% Argon: 0.934% Carbon dioxide: 0.03% If you add these up you get: 78.084 + 20.946 + 0.934 + 0.03 = 99.994% (the remaining material 100 - 99.994 ...
Question: 1.31. Molecular Weight of Air. For purposes of most engineering calculations, air is assumed to be composed of 21 mol % oxygen and 79 mol % nitrogen. Calculate the average molecular weight. Ans. 28.9 g mass/g mol, lb mass/lb mol, or kg mass/kg mol
QUESTION 2 Given: Molecular weight of air = 29 kg/kgmole and of CO2 = 44 lb/lbmole R = 8315 Nm/kgmole.K and 1545 ft. Ib/ lbmole.OR 1 ft = 12 in. 2.1 An empty can was sealed in a room at 90°C and 1 atm pressure. What will be the vacuum after the can and contents cool down to 30°C? Assume that only air is in the can.
1. [30 pts] Calculate the molecular weight Air and Dodecane (C12H26). Calculate the fuel/air ratio (mg/ma) and number of moles of air (required if combustion of C12H26 + Air results in a 1,000 K temperature rise in air entering the combustor with Cp = 1.080 k) kg-K Use . the LHV = Qnet,p for C12H26 from p. 286 in your book.
If the molecular weight of air is 28.9, what is the density of air at atmospheric pressure and a temperature of 316.4 K? 1 atm = 1.013 × 105 N/m2 , the mass of a proton is 1.67262 × 10?27 kg , Avogadro’s number is 6.02214 × 1023 mol?1 and k = 1.38065 × 10?23 N · m/K . Answer in units of kg/m3 .
Given: Molecular weight of air = 29 kg/kgmole R = 8315 Nm/kgmole.K Vapour pressure @ 20°C = 2,3366 kPa 1. Using the Ideal Gas Equation, determine an equation for density and calculate the density of air at 150°C and 5 atm pressure. 150 2. a) Give the value of standard atmospheric pressure in two different units.
What is the molecular weight of air with an absolute humidity if 0.01372 kg water/kg dry air (or 60% relative humidity at 300 K and 101,325 Pa? Dry air (no humidity) has a molecular weight of ~28.96 kg/kmol.
Question: If 100 g of air consists of 77% by weight of nitrogen , molecular mass {:=28), and 23% by weight ofoxygen , molecular mass {:=32), calculate the mean molecular weight of air, mole fraction ofoxygen, and concentration of oxygen in molm3 and kgm3, if the total pressure is 1.5 atm and thetemperature is 25°C.
Calculate the average molecular weight of air a) from its approximate molar composition of 79% N2, 21% O2 and b) from its approximate composition by mass of 76.7% N2, 23.3% 02. Show transcribed image text
The density of air can be calculated using the ideal gas law. If the molecular weight of air is taken to be 28.7 kg/kmol, estimate the air density at 300 K and 101,325 Pa. There are 2 steps to solve this one.