How much mortar per meter cubed in a meter squared of brickwork on a 1 brick thick wall?

Answer 1

More information is needed to give a precise answer.

It depends on the thickness of the mortar between bricks (both horizontal and vertical mortar joints), the dimensions of the bricks used and how the bricks are stacked.

Some fire brick used in furnaces and fireplaces has almost no mortar between bricks and fire bricks tend to be larger.

One interesting consideration is that this question is asked in terms of meters while most brick is not. Thus alignment of bricks or math to address partial bricks at the edges is important

By way of example inspect this URL:

http://www.mc2-ice.com/support/estref/popular_conversion_files/masonry/brick.htm