Gases calculations

For mixtures of gases, calculate the average MCp by multiplying the individual gas mol % of each component by its respective MCp (see reference 60 or other sources for tables) and sum to get the molar average, MCp, for the mixture. For the ratio of specific heat, see Equation 12-28. 

J. van Kranendonk. Induced infrared absorption in gases. Calculation of the binary absorption coefficients of symmetrical diatomic molecules. Physica, 24 347, 1958. 

Values of specific gravities of reservoir gases calculated with Equation 7-9 and the appropriate figures will be within 2% of laboratory determined values. 

In a single-stage compressor Suction pressure = 101.3 kN/m2. Suction temperature = 283 K. Final pressure = 380 kN/m2. If each new charge is heated 18 deg K by contact with the clearance gases, calculate the maximum temperature attained in the cylinder. 

The figures in parentheses in each case are the vapor pressures of the pure liquids. Assuming the vapors to behave as ideal gases, calculate (i) the free energy, (ii) the excess free energy, (iii) the heat, of mixing per mole of the equimolar mixture at 45 C. (Use a form of the Gibbs-Helmholtz equation to derive AH from AF the total pressure may be supposed to be constant.)... 

At some point in the reaction described in Q.l 1.6, there are 1.9 moles of carbon monoxide, 2.S moles of oxygen, and 0.4 moles of carbon dioxide. Assuming they are ideal gases, calculate Q. 

When 1.00 g of a certain fuel gas is burned in a calorimeter, the temperature of the surrounding 1.000 kg of water increases from 20.00°C to 28.05°C. All products and reactants in the process are gases. Calculate the heat given off in this reaction. How much heat would 1.00 mol of the fuel give off, assuming a molar mass of 65.8 g/mol ... 

Fig. 10-15 Relative radiative forcing of the climate system (normalized to CO2) due to increasing trace gases. Calculated radiative forcings are for smoothed 1979 annual trace gas increments. Radiative forcing for CFC-11 and CFC-12 added without constraints is based on extrapolations of the annual increase of these gases (8-11%) before 1974, when their production was severely curtailed. Adapted from Hansen et al. (1989) with the permission of the American Geophysical Union.

Given all but one of the following properties for a mixture of gases, calculate the one not given total pressure of the mixture of gases and partial pressure of each gas. 

Composition of gases calculated for respective temperature of explosion ... 

Solubility parameters of several gases calculated from equation 5.11 are shown in table 5.2 (King, 1984). Choosing a pressure level of 400 atm, the solubility parameter of carbon dioxide is about 7.3 (at 40°C) and about 6.0 (at 37°C) for ethane. We shall refer to these values subsequently when we present some interesting experimental facts on the behavior of certain liquids with these two gases. If we assume that the rule of thumb, 62 — il, can be... 

FIGURE 23.14 Integrated radiative forcing (W m 2 kg 1 yr) for a range of greenhouse gases, calculated from Figure 23.13 (IPCC 1995). 

The steamcracker of ethane in Example 1 has an operating cycle of 300 days a year. The conversion per pass is 60%. The mass composition of the hydrocarbon products withdrawn as follows 80% C2H4 1.4% C3H 4.8% C4H3 0.2% petrol 13.6% fuel gases. Calculate the mass flow rates of the supply, of the withdrawn products and of the recycling of the unit, and the selectivities of the alkenes. 

FIGURE 2.6 Relative mobilities for Cs in noble gases calculated using ab initio potentials, as a fimction of effective temperature scaled by the potential depth. (From Barnett, D.A., EUs, B., Guevremont, R., Purves, R.W., Viehland, L.A., J. Am. Soc. Mass Spectrom., 11, 1125, 2000.)... 

Hv(Tb) and dy both can be estimated at combustion reference conditions using DIN 51857 1997-03 Gaseous fuels and other gases - Calculation of calorific value, density, relative density and Wobbe index of pure gases and gas mixtures [11], It is normal to give a Wobbe Index without units avoid any possible confusion with the volumetric heating value of the gas [12]. 

Densities for ideal gases calculated with equation p = PMIKY at 293.15 K and 101.325 kP. 

I LEARNING CHECK 6.13 Some nuclear reactors are cooled by gases. Calculate the number of calories that 1.00 kg of helium gas will absorb when it is heated from 25°C to 700°C. See Table 6.8 for the specific heat of He. 

The second and third virial coefficients in the equation of state of rare gases calculated by the use of Eq. (49) with s = 12 agree with observed values when the nonadditivity of the intermolecular potential is taken into account. If we assume additivity, on the other hand, then we must use an effective intermolecular potential with a wider bowl in order to explain the temperature dependence of the third virial coefficient.In other words, the influence of nonadditivity of the intermolecular potential can, to some extent, be eliminated by using an effective (additive) intermolecular potential with a wider bowl. An appropriate choice seems to be not far from Eq. (50) with a = 8.675, for which the two structures of close packing have exactly equal cohesive energies. 

---