DOUGSCI
STUDY GUIDE ANSWERS:MOLES, GRAMS, AND MOLECULESPART 1: Define the following terms:Mole: unit of quantity describing 6.02 x 1023 thingsAtom: smallest component of an elementAtomic mass: mass of an atom of a chemical elementMolecule: group of atoms bonded togetherMolar mass: mass of given element/compound divided by amount of substance; unit is grams per mole (g/mol)Avogadro’s number: 6.02 x 1023, number of atoms/molecules in one mole of a substanceGram: unit of mass equal to one thousandth of a kilogramPART 2: Fill in the blanks.12 is to one dozen as 6.02 x 1023 is to one mole.PART 3: Copy this simplified version of the mole conversion diagram below and use it to answer questions 2-14.Before you can multiply or divide by the molar mass, you must first find/calculate the molar mass.When converting from a specific number of atoms to grams of atoms, there are two steps. What are they?Divide by Avogadro’s numberMultiply by atomic massWhen converting from grams of atoms to a specific number of atoms, there are two steps. What are they?Divide by atomic massMultiply by Avogadro’s numberWhen going from a specific number of molecules to grams of molecules, there are two steps. What are they?Divide by Avogadro’s numberMultiply by molar massWhen going from grams of molecules to a specific number of molecules, there are two steps. What are they?Divide by molar massMultiply by Avogadro’s numberWhen going from grams of molecules to moles of molecules, you have to divide bythe molar mass.When going from grams of atoms to moles of atoms, you have to divide by theatomic mass.When going from moles of molecules to grams of molecules, you have to multiply bythe molar mass.When converting from moles of atoms to grams of atoms, you have to multiply bythe atomic mass.When converting from moles of molecules to a specific number of molecules, you have tomultiply by Avogadro’s number.When going from moles of atoms to a specific number of atoms, you have tomultiply by Avogadro’s number.When converting from a specific number of molecules to moles of molecules, you have todivide by Avogadro’s number.When going from a specific number of atoms to moles of atoms, you have todivide by Avogadro’s number.PART 4: Use the conversion diagram to properly convert the quantities in questions 17-28.SHOW YOUR WORK OR YOU WILL NOT RECEIVE ANY CREDIT!!EXAMPLE:How many moles are there in 30.0 grams of H2O? 1.67 molHow many moles are there in 325 grams of calcium? 8.11 molHow many grams are there in 2.25 moles of NaCl? 131 gHow many grams are there in 4.0 moles of potassium? 156 gHow many molecules are there in 6.20 moles of CO2? 3.73 x 1024 moleculesHow many atoms are there in 3.5 moles of boron? 2.1 x 1024 atomsHow many moles are there in 9.55 x 1025 molecules of AlNaO6Si2? 158 molHow many moles are there in 7.9 x 1019 atoms of scandium? 0.00013 molHow many grams are there in 5.7 x 1019 molecules of H6Cu2O21Pb5S3? 0.15 gHow many grams are there in 3.55 x 1026 atoms of oxygen? 9,435 g or 9.435 kgHow many molecules are there in 325 grams of H4CaO6S? 1.03 x 103 moleculesHow many atoms are there in 230 grams of lithium? 2.00 x 1025 atoms ................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.