A mixture of NaBr and Na2 SO4 contains 29.96 percent Na by mass. Calculate the percent by mass o

A mixture of NaBr and Na2 SO4 contains 29.96 percent Na by...

Key Concepts

Percent Composition

Percent composition refers to the fraction of the mass of an element in a compound relative to the total mass of the compound, expressed as a percentage. This concept is fundamental in both analytical and synthetic chemistry, as it allows for the determination of how much of a particular element or compound is present in a mixture.

Molar Mass

Molar mass is the mass of one mole of a substance and is calculated by summing the atomic masses of all the atoms in a molecule. This concept serves as a bridge between the number of moles and the mass of a substance, which is crucial when dealing with chemical compositions and reactions.

Mass Balance in Mixtures

The mass balance concept in mixtures involves accounting for the mass contributions of all components to ensure that the total mass is conserved. This principle is applied to determine the proportion of each component in a mixture by setting up equations based on the individual masses and the overall composition.

Simultaneous Equations in Chemistry Calculations

Simultaneous equations are used to solve for unknown variables when multiple conditions are given, such as the overall composition of a mixture and the known properties of each component. In mixture problems, they enable the determination of the percentage contributions of different substances by relating their individual characteristics through one or more equations.

Transcript

00:02 We have given information the percent by mass of sodium in a mixture of sodium bromide and sodium sulfate is 29 .96%.

00:56 We have to calculate calculate the percent by mass of each compound.

01:19 In the mixture let us assume that the mass of a mixture is 100 grams the mass of sodium is then mass of sodium is equal to 29 .96 gram and number of molts of sodium bromide into molar mass of sodium bromide plus number of moles of sodium sulfate into molar mass of sodium sulfate is equal to 100 gram so molar mass of n a sodium into number of moles of sodium bromide plus 2 into number to into molar mass of sodium into number of sodium sulfate is equal to 29 .96 gram and 22 .999 gram gram per mole into the number of moles of sodium bromide plus 2 into 22 .99 gram per mole into number of of sodium sulfate is equal to 29 .96 gram and number of moles of sodium bromide is equal to 29 .96 gram minus 2 into 22 .99 gram per mole into number of of sodium sulfate divided by 22 .999 gram per mole.

06:11 Is equal to 1 .303 minus 2 into number of moles of sodium sulfate.

06:33 The molar mass of nabr sodium bromide in sodium sulfate is molar mass of sodium bromide is equal to molar mass of sodium bromide is equal to molar mass of sodium plus molar mass of bromine is equal to molar mass of sodium is 22 .999 gram per mole plus molar mass of bromine is 79 .904 gram per mole is equal to 102 .894 gram per mole is the molar mass of sodium bromide and the molar mass of sodium sulfate is equal to 2 into molar mass of sodium plus molar mass of sulfur plus 4 into molar mass of oxygen is equal to 2 into molar mass of sodium is 2 .990 gram per mole plus smaller mass of sulfur is 32 .065 gram per mole plus smaller mass of oxygen is 4 into 15 .999 gram per mole is equal to the calculated molar mass of sodium sulfate is 1 .4.

08:57 42 .041 gram per mole.

09:12 Now we can find the mass of each compound in a mixture in the mixture.

09:41 So number of moles of sodium bromide into molar mass of sodium bromide plus number of of sodium sulfate into molar mass of sodium sulfate is equal to 100 gram so 1 .303 minus 2 into number of moles of sodium sulfate, sodium sulfate into 102 .894 gram per mole, plus number of moles of sodium sulfate into 142 .1041 gram per mole, is equal to 100 gram.

11:10 So number of moles of sodium sulfate into 63 .47 gram per mole is equal to 34 .071 gram.

11:35 So number of moles of sodium sulfate is equal to 0 .53...

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