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There are cases when it is compelled to recognize the percent the an facet in a known chemical formula. This ar will show how to make these calculations.

You are watching: What is the mass percent of sodium in nacl?

There are involves that there is too much sodium in our diets. There are many compounds provided in food assets that contain sodium. Sodium chloride (NaCl, table salt) is the most frequently used compound to include salt to foods.

What is the percent sodium in the link NaCl?Step 1: calculate the gram formula load for NaCl.

The gram atomic load (GAW) for Na is 22.99 g / molThe gram atomic load (GAW for Cl is 35.45 g / molThe gram formula load (GFW) because that NaCl is 58.44 g / mol

Step 2 calculate the % Na in NaCl:From the previous ar Determination of chemistry Formulas friend should recognize the calculate is:


An Example:A biscuit cooking recipes has salt (NaCl) and baking powder that has baking soda (NaHCO3), sodium aluminum sulfate (NaAl(SO4)2 ). I m sorry compound has actually the greatest percent Na? indigenous the calculation above, we understand NaCl is 39.34 %.

Percent Na in NaHCO3 :



Percent Na in NaAl(SO4)2



Based on the preceding calculations, NaCl has actually the highest % that Na

Knowing the percent composition of link is provided to calculation the grams that an aspect in a given mass the the compound(s). An instance of this can be displayed using a biscuit recipe.

Baking powder is a mixture include 30 % baking soda and 24 % sodium aluminum sulfate.

A biscuit cooking recipes calls for 3g the NaCl and also 9 g baking powder (NaHCO3 & NaAl(SO4)2)

Since baking flour is 30 % NaHCO3 and also 24 % NaAl(SO4)2 , the first calculation would certainly be to main point 9 g of baking soda by the percent of each chemical to determine the grams of each chemical, NaHCO3 and also NaAl(SO4)2.

Grams of NaHCO3 = 0.30 x 9 g baking flour = 2.7 g NaHCO3

Grams of NaAl(SO4)2 = 0.24 x 9 g baking flour = 2.16 g NaAl(SO4)2

Grams total from ingredients: = grams from NaCl + grams native NaHCO3 + g indigenous NaAl(SO4)2.

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The calculation is: (using the percents calculate above)

Total grams = (0.3934 x 3 g NaCl ) + (0.2738 g x 2.7 g NaHCO3 ) + ( 0.095 x 2.16 g NaAl(SO4)2 ) = 2.125 g Na

The student will encounter calculations such together these in a continual general chemistry class.