7. at a pressure of 3800 torr, a sample of gas occupies 40 liters. what volume will the
same sample occupy at 1.0 atmosphere?

V₂ = 200 L

Explanation:

Given data:

Initial pressure = 3800 torr( 3800/760 = 5 atm)

Initial volume = 40 L

Final volume = ?

Final pressure = 1.0 atm

Solution:

P₁V₁ = P₂ V₂

V₁ = Initial volume

P₁ = Initial Pressure

V₂ = Final volume  

P₂ = Final Pressure

Now we will put the values in formula.

P₁V₁ = P₂ V₂

V₂ = P₁V₁ / P₂

V₂ = 5 atm ×40 L / 1.0 atm

V₂ = 200 atm.L / 1.0 atm

V₂ = 200 L

i believe that it is a exoplanet

  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-