HEL There are 3 astronauts, and each produce 500g of CO2 every day. This means they will produce 3000g of CO2 in 2 days (3 x 500g x 2 = 3000g). How many moles of CO2 is that? (round to the nearest tenth) *

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 !

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

the objects have the same charge.