At this stage most of the answers to the questions you raise are still in flux.
The one that can be reasonably assumed is ratio of hydrogen to graphite. In the pure reaction case it is 3 ton of graphite to 1 ton of hydrogen.
But looking at the modelling in a commercial environment it will be 4.4 ton graphite to 1 ton of hydrogen,
so in the 1000t graphite case 250 ton of hydrogen
The world market for graphite is $15b @ an assumed $500/ton a 30,000 million ton market.
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