# chem

consider a mixture of air and gasoline vapor in a piston. original V is 30cm^3. if the combustion of misture releases 985J energy, to what volume will the gases expand against a constant pressure of 655 torr if all energy of combustion is converted into work ro push back the piston?

in L

1. 👍 0
2. 👎 0
3. 👁 189
1. Mel--This answer doesn't look right to me so check it out.
work = -p(V2-V2)= -985
change p to atmospheres.
change V to liters.
I get something like 1,000 liters and that sounds far to large. Perhaps Bob Pursley will look at this.

1. 👍 0
2. 👎 0
2. That should be -P(V2-V1) and solve for V2.
Also, last sentence should read "far too large."

1. 👍 0
2. 👎 0
3. type this in the Google search window:

985joules/655torr in liters

That gives you delta Volume.

1. 👍 0
2. 👎 0
👨‍🏫
bobpursley
4. I found my problem. I didn't convert J to L-atm.
985 J/101.325 = 9.72
Then -9.72 = -(655/760)(V2-V1)
9.72 = 0.862V2 - 0.862*0.03
V2 = 11.3 liters.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### chemistry

The air within a piston equipped with a cylinder absorbs 570J of heat and expands from an initial volume of 0.12L to a final volume of 0.88L against an external pressure of 1.0 atm. What is the change in internal energy of the air

2. ### science

The air temperature is 70 degrees, and the relative humidity is 90%. Which conclusion can be made? A.The dew point temperature is 90% of the air temperature. B.The temperature must rise in order for air to become saturated with

3. ### metreology lab

1. Saturated (cloudy) air at a temperature of 20 °C (68 °F) has a relative humidity of _________%. 2. Compute the relative humidity (RH) to nearest percent for each of the following atmospheric conditions: a. vapor pressure = 6

4. ### Engineering/Physics

When gasoline is burned in the cylinder of an​ engine, it creates a high pressure that pushes on the piston. If the pressure is 150 ​pound-force per square​ inch, and it moves the 3​-inch diameter piston a distance of 6

1. ### physics

A cylinder that has a 40.0 cm radius and is 50.0 cm deep is filled with air at 20.0°C and 1.00 atm. A 21.0 kg piston is now lowered into the cylinder, compressing the air trapped inside. Finally, a 79.0 kg man stands on the

2. ### chemistry

An unknown mixture containing KClO3 was added to an ignition tube weighting 41.960g, The tube and mixture was then found to weight 43.772g. After the first heating, the tube and its contents weighed 43.621g. After the second and

3. ### physics

Please see if I am doing this problem right. A mixture of gasoline vapor and air is placed in an engine cylinder. The piston has an area of 7.4 X 10^-3 m^2 and is displaced inward by 7.2 X 10^-2 M. If 9.5 X 10^5 Pa of pressure is

The motion of a piston in an auto engine is simple harmonic. The piston travels back and forth over a distance of 23 cm, and the piston has a mass of 1.7 kg. 2515 rpm 23 cm max speed of the piston 30.28757 m/s What is the maximum

1. ### Chemistry

Gasoline is a mixture of hydrocarbons, a major component of which is octane,CH3CH2CH2CH2CH2CH2CH2CH3. Octane has a vapor pressure of 13.95 torr at 25 degrees celcius and a vapor pressure of 144.78 torr at 75 degrees celcius. Use

2. ### chem

What happens during the intake stroke of a four-stroke internal combustion engine? A. The piston moves downward, creating a partial vacuum that draws in air and fuel. B. The piston moves downward as a result of the air/fuel

3. ### Chemistry

Gasoline is primarily a mixture of hydrocarbons and is sold with an octane rating that is based on a comparison with the combustion properties of isooctane. Gasoline usually contains an isomer of isooctane called tetramethylbutane

4. ### physic

An air column in a glass tube is open at one end and closed at the other by a movable piston. The air in the tube is warmed above room temperature, and a 350 Hz tuning fork is held at the open end. Resonance is heard when the