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A mixture of $\mathrm{NaBr}$ and $\mathrm{Na}_{2} \mathrm{SO}_{4}$ contains 29.96 percent Na by mass. Calculate the percent by mass of each compound in the mixture.

The $\%$ by mass of $\mathrm{NaBr}$ is $24 \%$ The $\%$ by mass of $\mathrm{Na}_{2} \mathrm{SO}_{4}$ is $76 \%$

Chemistry 101

Chapter 3

Mass Relationships in Chemical Reactions

Chemical reactions and Stoichiometry

Carleton College

Rice University

Drexel University

University of Toronto

Lectures

04:02

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Chemical reactions can be either spontaneous, requiring no input of energy, or non-spontaneous, typically following the input of some type of energy, such as heat, light or electricity. Chemical reactions are usually characterized by a chemical change, and they yield one or more products after the reaction is complete. Chemical reactions are described with chemical equations, which symbolically present the starting materials, end products, and sometimes intermediate products and reaction conditions. Chemical reactions happen at a characteristic reaction rate at a given temperature and chemical concentration. Typically, reaction rates increase with increasing temperature because there is more thermal energy available to reach the activation energy necessary for breaking bonds between atoms.

08:02

In chemistry, a combination reaction is a chemical reaction in which two or more reactants combine to form more than one product. In a decomposition reaction, one reactant splits into two or more products.

02:36

A mixture of NaCl and NaBr…

0:00

07:41

01:33

A mixture of $\mathrm{NaCl…

04:23

07:17

A $0.9157-\mathrm{g}$ mixt…

24:34

A sample containing $\math…

We have given information. The percent by mass of sodium in a mixture of sodium bromide and sodium sulfate is 29.96 percent. We have to calculate calculate the percent by mass of h, compoundin the mixture. Let us assumehethat. The mass of micksere is 100 drums. The mass of sodium is then mass of sodium is equal to 29.96 gram and number of moles of sodium bromide. Mumeinto molar mass of sodium bromide plus number of moles of sodium sulfate into molar mass of sodium sulfite is equal tone. Hundredso molar mass of n, a sodium into number of moles of sodium bromide plus 2 into number 2 into molar mass of sodium into number of moles of sodium sulfate is equal to 29.96 gram. Men 22.990 gram per mole into molar number of moles of sodium bromide plus 2 into 22.99 gram per mole into a number of moles 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 a number of moles of sodium sulfite, divided by 22.990 gram per mole, is equal to 1.303 minus 2 into number of moles of sodium sulfate. The molar mass of sodium bromide and sodium sulphate is a molar. Mass of sodium bromide is equal to molar. Mass of sodium plus molar mass of bowline is equal to molar. Mass of sodium is 22.990 gram per mole, plus smaller mass of bromine is 79.904 gram per mole is equal to 102.894 grams 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 sulphur plus 4 into molar mass of oxygen is equal to 2 into molar. Mass of sodium is 22.990 gram per mole, plus smaller mass of sulphur is 32.065 gram per mole, plus smaller mass of oxygen is 4 into 15.999. Gram per mole is equal to the calculated molarmass of sodium. Sulfate is 142.041 gram per mole. Now we we can find the manse compound in a mixture in the mixture, so number of moles of sodium bromide into molar mass of sodium bromide plus. The number of moles of sodium sulfite into molar mass of sodium sumpit is equal to 100 gram. So 1.303 minus 2 into number of moles of sodium sulfite sodium sulfite into 102.894 gram per mole plus number of moles of sodium sulfate into 142.41 gram per mole is equal to 100 gram. So number of moles of sodium sulfate into 63.747 gram per mole is equal to 34.071 gram. So number of moles of sodium sulfate is equal to 0.534. Moleso number of moles of sodium bromide is equal to 1.303 minus 2 into a number of moles of sodium sulfate is equal to 1.303 minus 2 into 0.534. Mole is equal to 0.3 0.0 .234 molethe mass of sodium bromide is mis. Mass of sodium bromide is equal to a number of moles of sodium bromide into molar. Mass of sodium bromide is equal to 0.234 mole into 102.894. Gram per mole is equal to 24.077 gram and the mass of sodium sulphate, isis mass of sodium sulfate is equal to a number of moles of sodium sulfate into molar mass. If sodium sulfite is equal to 0.534 mole into 102.89 fouros sodium sulfate is sodium. Sulfate is 142.041 gram per mole is equal to 75.850 gram, and the percent by mass of sodium bromide is percent by mass of sodium bromide is equal to 24.077 gram divided by 100. Gram into 100 percent is equal to 24 percent and to the percent byers of sodium sulfate is percent by mass of sodium sulfate is equal to 75.850 gram divided by 100. Gram into 100 percent is equal to 76 percent. So the result isthepercentg by mass of sodium bromide is 24 percent. Mitypercent by mass of sodium sulfate is 76 percent.

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