Sodium chloride mass percent composition

Another way to express how much of an element is in a given compound is to use the element s mass percent composition for that compound. The mass percent composition or simply mass percent of an element is the element s percentage of the total mass of the compound. For example, the mass percent composition of sodium in sodium chloride is 39%. This information tells us that a 100-g sample of sodium chloride contains 39 g of sodium. The mass percent composition for a compound can be determined from experimental data using the formula ... 

We can use mass percent composition as a conversion factor between grams of a constituent element and grams of the compoxmd. For example, we just saw that the mass percent composition of sodium in sodium chloride is 39%. This can be written as ... 

EXAMPLE 6.8 Using Mass Percent Composition as a Conversion Factor The FDA recommends that adults consume less than 2.4 g of sodium per day. Flow many grams of sodium chloride can you consume and still be within the FDA guidelines Sodium chloride is 39% sodium by mass. ... 

The percent composition of a compound is the percent by mass of each element in the compound. Every sample of sulfur trioxide, S03, is 60.0% sulfur and 40.0% oxygen, by mass. This means that a 100.0-gram sample of sulfur trioxide contains 60.0 g of sulfur and 40.0 g of oxygen. Sodium chloride, NaCl, is 39.3% Na and 60.7% Cl, by mass. One hundred grams of NaCl contain 39.3 g of sodium and 60.7 g of chlorine. 

A mixture contains only sodium chloride and potassium chloride. A 0.1586-g sample of the mixture was dissolved in water. It took 22.90 mL of 0.1000 M AgNOa to completely precipitate all the chloride present. What is the composition (by mass percent) of the mixture ... 

Consider an aqueous solution containing sodium chloride that has a density of 1.01 g/mL. Assume the solution behaves ideally. The freezing point of this solution at 1.0 atm is -1.28X. Calculate the percent composition of this solution (by mass). 

PURPOSE OF EXPERIMENT Determine the percent composition by mass of an unknown mixture of sodium nitrite, NaN02, and sodium chloride, NaCl, after collecting a gas evolved by reaction of NaN02. 

The sodium chloride in your salt shaker is the same substance whether it comes from a salt mine, a salt flat, or any other source. This fact is expressed in the law of definite (or constant) composition, which states that no matter what its source, a particular compound is composed of the same elements in the same parts (fractions) by mass. The fraction by mass (mass fraction) is the part of the compound s mass that each element contributes. It is obtained by dividing the mass of each element by the mass of the compound. The percent by mass (mass percent, mass %) is the fraction by mass expressed as a percentage (multiphed by 100). 

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