Question

Learning Goal: To use Avogadro's number to convert between microscopic units of atoms and molecules to the macroscopic world of chemical experiments. A mole is a unit of matter that represents a known number of particles that is large enough to be weighed on a laboratory balance. One mole of substance contains 6.022×1023 formula units, as shown in the following unit factor: 6.022×1023 formula units1 mol substance The value 6.022×1023 is called Avogadro's number. The term formula unit is a generic phrase that can mean a molecule, atom, ion, or whatever is represented by the chemical formula. For example, a mole of He contains 6.022×1023helium atoms. A mole of N2 contains 6.022×1023 diatomic N2 molecules but double that number of nitrogen atoms.

Part A A flask contains 0.240 mol of liquid bromine, Br2. Determine the number of bromine molecules present in the flask. Express your answer numerically in molecules.   molecules   SubmitHintsMy AnswersGive UpReview Part You may know that a million is 106, a billion is 109, and a trillion is 1012. A trillion trillion would be 1024 which is also known as a septillion. Part B Calculate the mass of 1.00×1024 (a septillion) molecules of water given that the molar mass of water is 18.02 g/mol. Express the answer numerically in grams.   g   Part C The fuel used in many disposable lighters is liquid butane, C4H10. How many carbon atoms are in 4.00 g of butane given that the molar mass of butane is 58.12 g/mol? Express your answer numerically in atoms.   carbonatoms

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