Arguably, given that Mars' gravity is quite a bit less than on earth... Items weigh only 1/3 what they do here.

If you could somehow get enough of it, you very well might be able to compress the CO2 atmosphere into dry ice surrounding an electro-resistive heating element, and use that to generate lots of gas on demand, and use it to leave orbit...

Let me get some figures real quick.

--

Mars' escape velocity is approximately 5km/sec.

CO2 has a density of 0.001977 g/mL of volume, at 1ATM, at 0C, in gaseous form. (at earth's gravity. Since this is Mars, we should take roughly 1/3 of that value for our Delta-V computation)

It has a density of 1.56 g/mL in ice form. (again, when on earth)

That means it expands ~789.07 times in volume, going from solid to gas, when at 1ATM of ambient pressure.

Mars has an ambient pressure of .088psi (610 pascals). (Earth's pressure at 1ATM is 101325 pascals), which is 1/166th the pressure.

If we keep exhausted gas at 0c, that means the degree of expansion is 166 times that on earth, so 1cm^2 of dry ice will expand to fill a volume of 130,985.62cm^2

--

If somebody else is actually more interested in this, that should get them started. As I sit here collecting trivia, and looking up online calculators to do the math for me, I am getting more and more sleepy and I have learned the hard way that I make stupid assed errors when in that condition. Somebody more awake can finish it if they really want to know if a solid fuel CO2 decomposition rocket is sufficient to get the delta-V needed to escape martian orbit.