PHYSICS 135 Chapter Notes - Chapter 18: Number Density, Partial Pressure, Dew Point
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18. 4. (a) identify: we are asked about a single state of the system. Set up: use eq. (18. 2) to calculate the number of moles and then apply the ideal-gas equation. T = (18 273) k 291 k (b) pv nrt. T must be in kelvins; (56. 2 mol)(8. 3145 j/mol k)(291 k) p. 6 (6. 80 10 pa)(1. 00 atm/1. 013 10 pa) 67. 1 atm p = Evaluate: example 18. 1 shows that 1. 0 mol of an ideal gas is about this volume at stp. 56. 2 moles the pressure is about 60 times greater than 1 atm. 1 (314 k)(2)(2) 1. 256 10 k 983 c. 3 (1. 30 atm)(2. 60 l) (0. 08206 l atm/mol k)(314 k) 0. 131 mol m tot nm= (0. 131 mol)(4. 00 g/mol) 0. 524 g. Evaluate: t is directly proportional to p and to v, so when p and v are each doubled the kelvin temperature increases by a factor of 4. Execute: (a) n, r, and v are constant. p.
