If a listener purchases an entire album instead of individual tracks, eMastered distributes the revenue based on a pro-rata calculation using the Splits set for each track.
This can be managed and viewed under the "Settings," tab of your distribution page:
For instance, if the album contains 2 songs and you have a 50% share of just one of them, you would receive 25% of the full album sale revenue.
To apply splits across every song on the release equally make sure to select "Release," under the Split Level field.