Hi! Just to be certain, before installing you can prepare a live DVD/USB of Zorin 6 and load it in your MacBook air.
Use it for as long as you like just to make sure that everything works,
Zorin-OS 6 Ultimate 32bit - Kernel 3.2.0-29
Genuine Intel CPU T2250 1.73GHz ‖ RAM 3086 MiB ‖ Hewlett-Packard G5040ea
Intel Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller 1280x800
Broadcom BCM4311 802.11b/g