Acylinder is filled with 10.0l of gas and a piston is put into it. the initial pressure of the gas is measured to be 209.kpa. the piston is now pulled up, expanding the gas, until the gas has a final volume of 78.0l. calculate the final pressure of the gas. be sure your answer has the correct number of significant digits.

Answer : The final pressure of the gas will be, 26.8 kPa

Explanation :

According to the Boyle's law, the pressure of the gas is inversely proportional to the volume of the gas at constant temperature of the gas and the number of moles of gas.

or,

or,

where,

= initial pressure of the gas = 209 kPa

= final pressure of the gas = ?

= initial volume of the gas = 10.0 L

= final volume of the gas = 78.0 L

Now put all the given values in this formula, we get the final pressure of the gas.

Therefore, the final pressure of the gas will be, 26.8 kPa

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-