It is not certified organic but it is produced without the addition of any fertilizers or harmful chemicals, however the materials that make up the blended compost (leaf matter, mushroom substrate, composted bark fines, etc.) could have come in contact with chemicals at some point in their life cycle.
To determine how much mulch to order, determine the total square footage you'd like to cover and divide by 120. So, if the area or planting bed you are trying to cover is 20 feet long and 12 feet wide that would be 240 square feet. Divide that by 120 and the result is 2. You will need 2 cubic yards of material to cover and area 240 square feet. This will be at a 2-3" depth which is the recommended thickness for most applications.