Consider a complete combustion process during which both the reactants and the products are maintained at the same state. Combustion is achieved with (a) 100 percent theoretical air. (b) 200 percent theoretical air, and (c) the chemically correct amount of pure oxygen. For which case will the amount of heat transfer be the highest? Explain.

Simplify each complex fraction.

$$\frac { \frac { 1 } { x } - \frac { 4 } { x } } { \frac { 3 } { y } + \frac { 5 } { y } }$$

Pulverized carbon at $25^\circ C,$ 1 atm enters an insulated reactor operating at steady state and burns completely with 200% of theoretical air entering at $25^\circ C,$ 1 atm. The adiabatic flame temperature, in K, is closely a. 1470, b. 1490, c. 1510, d. 1530.

A heat engine receives heat from a source at 1500 K at a rate of 600 kJ/s and rejects the waste heat to a sink at 300 K. If the power output of the engine is 400 kW, the second-law efficiency of this heat engine is (a) 42% (b) 53% (c) 83% (d) 67% (e) 80%

A standard number cube is tossed. Find each probability. P(even or less than 4 )

Consider a fuel that is burned with (a) 130 percent theoretical air and (b) 70 percent excess air. In which case is the fuel burned with more air?

A reaction involved in the formation of ozone in the upper atmosphere is $\mathrm{O}_2 \longrightarrow 2 \mathrm{O}$. Without referring to Table 10.3, indicate whether this reaction is endothermic or exothermic. Explain.

In a dry product analysis, the mole fractions are given for all gaseous products except a. $N_2,$ which is inert, b. any unburned fuel, c. water, d. all of the above.

Write the value of the underlined digit.

$$598,\underline{1}02$$

Indicate whether the following statements are true or false. Explain. In a dry product analysis, the mole fractions are given for all gaseous products except water vapor.

When methane burns completely with 200% of theoretical air, the air-fuel ratio on a molar basis is __________.

How to interpret Mr. Whymper from "Animal Farm"?

Indicate whether the following statements are true or false. Explain. Using a psychometric chart to analyze the adiabatic mixing of two moist air streams, the exit state falls just above a line connecting the two inlet states.

Find and use the mean and the standard deviation to compare the variability of the data sets. Sample A: 15, 12, 8, 18, 16, 13, 14, 10; Sample B: 16, 19, 11, 9, 8, 10, 15, 11