What is the molarity of a solution in which 9.8 moles of sodium chloride (nacl) is dissolved in water to a final volume of 3.2 l

The formula for molarity is

Molarity=moles of solute/liter of solution

In this situation

Moles of solution=9.8g of NaCl

Liter of solution=3.2L of water

Molarity=9.8/3.2

= 3.0625M

the answer is true.

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 !