A sample of flammable liquid is placed into an enclosed cylinder which is then fitted with a movable piston. Initially the cylinder contains a volume of 1.60 L. The sample is ignited producing gas and releasing 401.5 J of energy. To what volume will the cylinder expand to if it must expand against a pressure of 729.8 mmHg. Assume all the energy released is converted to work used to push the piston?

The volume of the cylinder after expansion is 5.73 L

Explanation:

To calculate the amount of work done for an isothermal process is given by the equation:

W = amount of work done  = -401.5 J = -3.962 L.atm      (Conversion factor: 1 L atm = 101.325 J)

P = pressure  = 729.8 mmHg =  0.960 atm      (Conversion factor: 1 atm = 760 mmHg)

= initial volume = 1.60 L

= final volume = ?

Putting values in above equation, we get:

Hence, the volume of the cylinder after expansion is 5.73 L

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).