A 0.772 g sample of a mixture containing only NaBr and CaBr2 is dissolved in water. An excess of an aqueous solution of Pb(NO3)2 is added. The PbBr2 that forms is filtered, dried, and weighed. The mass of PbBr2 is found to be 1.41 g. What is the mass of Br− ions in the sample? What is the mass percent of Br− ions in the original sample? What is the percent composition by mass of NaBr and CaBr2 in the sample?
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
A 0.772 g sample of a mixture containing only NaBr and CaBr2 is dissolved in water. An excess of an aqueous solution of Pb(NO3)2 is added. The PbBr2 that forms is filtered, dried, and weighed. The mass of PbBr2 is found to be 1.41 g. What is the mass of Br− ions in the sample?
What is the mass percent of Br− ions in the original sample?
What is the percent composition by mass of NaBr and CaBr2 in the sample?
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