The answer would be c.
your equation should look like:
reactants-----> products
You don't want a confound
Answer:2.04 kg
Explanation:
Given
mass of the first block 
Suppose it brings an extension of x units
When a second mass
is attached, then extension quadruples i.e. 4x
For the first case

For the second case

divide (i) and (ii)

Answer:
A. the amount of steam added to the air s 0.065kgH20/kg dry air
B.the amount of heat transfer to the air in the heating section is 5.1KJ/Kg of dry air
Explanation:
Pls see attached file