How to recognise uncountable nouns.? When should we avoid using articles especially before the nouns that act as both countable and uncountable nouns?
Divorce is 'mutual' by definition! One spouse can't be divorced and the other remain married.
When speaking of a particular couple, it's a divorce because it refers to the single legal decision that ends their marriage. Divorce is an uncountable noun when it refers to the concept of ending a marriage, or the practice as a social custom - 'Divorce is becoming more common in this country'.