For \u0394 E sys to always be what must be true A q w B q w C w q D w q 47 Which of

# For δ e sys to always be what must be true a q w b q

This preview shows page 8 - 10 out of 16 pages.

46) For ΔEsys to always be -, what must be true? A) q = w B) +q > -w C) +w > -q D) -w > +q 47) Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 J of heat? 48) Determine the specific heat capacity of an alloy that requires 59.3 kJ to raise the temperature of 150.0 g alloy from 298 K to 398 K. 49) A sample of copper absorbs 43.6 kJ of heat, resulting in a temperature rise of 75.0°C, determine the mass (in kg) of the copper sample if the specific heat capacity of copper is 0.385 J/g°C. 50) Calculate the change in internal energy (ΔE) for a system that is giving off 25.0 kJ of heat and is changing from 12.00 L to 6.00 L in volume at 1.50 atm pressure. (Remember that 101.3 J = 1 L·atm) A) +25.9 kJ B) -16.0 kJ C) -25.9 kJ D) -24.1 kJ E) 937 kJ 51) A 6.55 g sample of aniline (C6H5NH2, molar mass = 93.13 g/mol) was combusted in a bomb calorimeter. If the temperature rose by 32.9°C, use the information below to determine the heat capacity of the calorimeter. 4 C6H5NH2(l) + 35 O2(g) 24 CO2(g) + 14 H2O(g) + 4 NO2(g) Δrxn = -1.28 ×104kJ 52) The temperature rises from 25.00°C to 29.00°C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. Calculate ΔErxnfor the combustion of sucrose in kJ/mol sucrose. The heat capacity of the calorimeter is 4.90 kJ/°C. The molar mass of sugar is 342.3 g/mol. 53) Which statement is false? 54) How much energy is required to decompose 765 g of PCl3, according to the reaction below? The molar mass of PCl3is 137.32 g/mol and may be useful. 4 PCl3(g) P4(s) + 6 Cl2(g) Δrxn= +1207 kJ A) 2.31 ×103kJ B) 4.33 ×103 kJ C) 6.72 ×103kJ D) 1.68 ×103kJ E) 5.95 ×103kJ 55) How much energy is evolved during the formation of 98.7 g of Fe, according to the reaction below? Fe2O3(s) + 2 Al(s) Al2O3(s) + 2 Fe(s) Δrxn = -852 kJ  #### You've reached the end of your free preview.

Want to read all 16 pages?

• • •  