You have to start listing from the bottom :
3. Secondary Consumers
2. Primary Consumers
1. Producer
ΔΗ= -115.6 kJ/mol
H2 has a Mr of 2, so as mol=mass/mr we can work out that there are 4 moles of H reacting
Therefore we multiply -115.6 by 4 = -462.4
The orbit gets larger when the mass of the sun is reduced to 75,000.
What are the answer choices ?