Q3.27. Over long time scales the solubility-temperature feedback (below), can affect climate. An increase in atmospheric CO2 concentrations increases the greenhouse effect and causes temperatures to rise. As ocean temperatures rise, the solubility of CO2 decreases. As a result, CO2 is released from the oceans to the atmosphere, strengthening the greenhouse effect and causing temperatures to rise further. What type of feedback is this

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

the answer is d.) potassium