Concept explainers
Interpretation:
Density is defined as molar mass, M, divided by molar volume:
Concept introduction:
Gaseous systems are used to study M,
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PHYSICAL CHEMISTRY-STUDENT SOLN.MAN.
- Which of the following quantities can be taken to be independent of temperature? independent of pressure? (a) H for a reaction (b) S for a reaction (c) G for a reaction (d) S for a substancearrow_forward(6) Consider an ideal gas for which pV = n RT. Determine the change in pressure, p, for n = 2.0 moles of an ideal gas when the temperature, T, is changed from 190K to 200K and the volume, V, is changed from 20L to 19L. The gas constant is R = 8.314 J• mol-1 • K-1. Express your answer in atmospheres. HINT: Use an expression for the total differential dp(T, V). Evaluate your partial derivatives at the point (V,, T¡) with the increments in volume dV = (V, – V,) and dT = (T, – T,)arrow_forwardOne of the more commonly used compressed gases is nitrogen (N2), often in large metal cylinders. If a cylinder holds 711 mol of N2 when pressurised to 5.3 x 104 kPa at T = 20oC, how many litres is its capacity?arrow_forward
- When air expands adiabatically (without gaining or losing heat), its pressure P and volume V are related by the equation PV14 = C where C is a constant. Suppose that at a certain instant the volume is 310 cubic centimeters and the pressure is 87 kPa and is decreasing at a rate of 8 kPa/minute. At what rate in cubic centimeters per minute is the volume increasing at this instant? cm3 min (Pa stands for Pascal it is equivalent to one Newton/(meter squared); kPa is a kiloPascal or 1000 Pascals.arrow_forward(c) The Cp of a sample of a perfect gas is related to the temperature as shown below: Cp/(J.K-1) = 38.77+1.52| Calculate q, w, AU, and AH when the temperature is raised from 8°C to 124°C (i) at constant pressure, (ii) at constant volume. (8)arrow_forward(7) Combustion of CH4 and H₂. For 100 g mol of a gas mixture of 75 mol % CH4 and 25 mol % H₂, calculate the total heat of combustion of the mixture at 298 K and 101.32 kPa, assuming that combustion is complete.arrow_forward
- 3arrow_forwardThe heat capacity ratio of an ideal gas is 1.38. What are its Cv and Cp values?arrow_forward(a) Derive, given that dU = dq+ dw, and considering that dU is an exact differential, a general relation between Cy and Cp. (b) Consequently, assume ideal gas behaviour and simplify your result.arrow_forward
- The equation of state of a liquid gives the volume as a function of the temperature and pressure: V = V(T,P). Further, the thermal coefficient of expansion, a , is defined as 1 (av v (ôT while the compressibility coefficient, ß , is defined as 1 (av v ( OP Assuming a to be independent of temperature and ß to be independent of pressure, deduce the expression for V as a function of T and P.arrow_forward7C. The total differential for H(T,P) (where H is enthalpy) is dT + ӘР dH dP Show that dH=C,dT for a process involving an ideal gas even if the pressure is changing. (Note that this requires that you show that (@H/@P),=0 for an ideal gas.arrow_forwardTrue or false. Why?arrow_forward
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