<span>4 C3H5(NO3)3 = 12 CO2 + 6 N2 + 10 H2O + O<span>2
That's the answer lovely~</span></span>
        
             
        
        
        
Disadvantage is your answer :)
        
                    
             
        
        
        
defined, a solid will always have a definite shape and volume because it doesn´t depend on its container shape 
 
        
                    
             
        
        
        
Answer : The original volume of gas was, 3.0 L
Explanation :
Charles' Law : It is defined as the volume is directly proportional to the temperature of the gas at constant pressure and number of moles.

or,

where,
 are the initial volume and temperature of the gas.
 are the initial volume and temperature of the gas.
 are the final volume and temperature of the gas.
 are the final volume and temperature of the gas.
We are given:

Now put all the given values in above equation, we get:

Thus, the original volume of gas was, 3.0 L