Refrigeration Problem

Hi, how do I attempt to answer this:

At the commencement of compression in the reciprocating compressor

of a refrigeration plant the refrigerant is dry saturated at 1 bar. The

compression process follows the law pV^1.1 = C, until the

pressure is 10 bar.

•Calculate the work done on the refrigerant during the process?

Is it W = m(h2 - h1) ?

I don't know if the pV^1.1 is relevant.

Thanks for any help.