Calculate the percent by mass when 40.0 grams of NaCl is dissolved into enough water to make 100. grams of solution.

Percent by mass when 40.0 grams of NaCl is dissolved into enough water to make 100. grams of solution is 40% .

Explanation:

Given,

Mass of NaCl = 40 grams

Mass of Solution = 100 grams

In this solution, NaCl is solute and Water is the solvent.

Mass percent of a solution can be calculated using the formula,

Mass percent =  (Mass of Solute/Mass of Solution)x(100)

As NaCl is solute, mass of solute = 40 grams

 Mass of solution = 100 grams

Substituting the values, Mass percent = (40/100)x(100) = 40%

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 !

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