Determine the lower heating value, in kJ per kmol of fuel and in kJ per kg of fuel, at $25^\circ C,$ 1 atm for a. gaseous ethane $(C_2H_6).$ b. liquid ethanol $(C_2H_5OH).$ c. gaseous propane $(C_3H_8).$ d. liquid octane $(C_8H_{18}).$

The higher heating value of liquid octane at the standard state is _____ kJ/kg.

To take advantage of a going-out-of-business sale, the College Corner Furniture Store had to borrow some money. It paid back a total of $150,000 on a 6-month loan at 12%. Find the principal.

Buffalo, Utica, Albany, and Syracuse, New York, are all connected by Interstate 90 · Albany is 126 miles from Syracuse and 263 miles from Buffalo. · Buffalo is 137 miles from Syracuse and 184 miles from Utica. Draw a diagram to represent the locations of the cities in relation to each other and the distances between each city. Assume that Interstate 90 is straight.

What are the higher and the lower heating values of a fuel? How do they differ? How is the heating value of a fuel related to the enthalpy of combustion of that fuel?

Use a scientific or graphing calculator to evaluate each of the following to the nearest tenth. Make sure your calculator is in DEGREE mode.

$$\sin ^ { - 1 } \frac { 1 } { 2 } =$$

$$\cos ^ { - 1 } \frac { 1 } { 2 } =$$

$$\tan ^ { - 1 } \frac { 1 } { 2 } =$$

$$\sin ^ { - 1 } \frac { 3 } { 4 } =$$

$$\cos ^ { - 1 } \frac { 3 } { 4 } =$$

$$\tan ^ { - 1 } \frac { 3 } { 4 } =$$

Methane $(CH_4)$ at $25^\circ C,$ 1 atm enters a furnace operating at steady state and burns completely with 140% of theoretical air entering at 400 K, 1 atm. The products of combustion exit at 700 K, 1 atm. Kinetic and potential energy effects are negligible. If the rate of heat transfer from the furnace to the surroundings is 400 kW, determine the mass flow rate of methane, in kg/s.

Propane gas $(C_3H_8)$ at $25^\circ C,$ 1 atm enters a reactor operating at steady state and burns with 20% excess au entering at $25^\circ C,$ 1 atm. Of the carbon entering with the fuel, 94% (molar basis) appears in the products as $CO_2$ and the rest as CO. Heat transfer from the reactor occurs at a rate of $1.4 \times 10^6 kJ$ per kmol of propane. Ignoring kinetic and potential energy effects, determine the temperature of the combustion products exiting the reactor, in K.

A sample of dried Appanoose County coal has a mass analysis of 71.1 % carbon, 5.1 % hydrogen $(H_2),$ 9.0% oxygen $(O_2),$ 1.4% nitrogen $(N_2),$ 5.8% sulfur, and the rest noncombustible ash. For complete combustion with the theoretical amount of air, determine a. the amount of $SO_2$ produced, in kg per kg of coal. b. the air-fuel ratio on a mass basis.

Butane $(C_4H_{10})$ burns completely with 160% of theoretical air at $20^\circ C,$ 1 atm, and 90% relative humidity. Determine a. the balanced reaction equation. b. the dew point temperature, in $^\circ C,$ of the products, when cooled at 1 atm.

A bat emits a sound whose frequency is 91 kHz. The speed of sound in air at

$$20.0 ^\circ C$$

is 343 m/s. However, the air temperature is

$$35 ^\circ C,$$

so the speed of sound is not 343 m/s. Find the wavelength of the sound.

Trevon is making payments on a car that costs $26,555. He makes 36 equal payments. If he rounds the equal payments up to the nearest whole dollar, about how much will he overpay after 36 months? Show your work to justify your answer.

What is the correct present tense form of the verb?
Su hermano ____ (pensar) bañarse.

A round above-ground swimming pool has a diameter of 15 ft and a height of 4.5 ft. What is the volume of the swimming pool? _