The molar mass represents not a single atom or molecule but it represents Avogadro's number ofatoms or molecules. The formula CS, represents 76.15 g (1 mole) of carbon disulfide. The percentageof sulfur by mass can be calculated as follows:2S/1 CS₂ = (64.14 g S/76.15 g CS₂) x 100 = 84.22% SThe following are examples how the mole concept is applied1. Mole to gram conversionDetermine the number of grams in 4.000 moles of H₂OMolar mass of H₂O = (2 x 1.01) + (1 x 16.00) = 18.02 g/mol1 mole H₂O = molar mass of H₂O = 18.02 grams H₂O4.000 mol H₂O x (18.02 g H₂O/ 1 mol H₂O) = 72.08 grams H₂O2. Gram to mole conversionDetermine the number of moles in 88.0 grams of CO₂Molar mass of CO₂ = (1 x 12.01) + (2 x 16.00) = 44.01 g/mol1 mole CO₂ = molar mass of CO₂ = 44.01 grams CO₂88.0 g CO₂ x (1 mol CO₂ / 44.01 g CO₂) = 2.00 moles CO₂3. Mole to molecule conversionDetermine the number of molecules of H₂O in 3.00 moles H₂O1 mole H₂O = 6.022 x 1023 molecules H₂O3.00 mol H₂O x (6.022 x 1023 molecules H₂O / 1 mol H₂O) = 1.81 x 10²4 molecules H₂O4. Mole to atoms conversionHow many atoms are present in 17.0 moles of water?In order to convert moles of a compound to atoms one must first convert moles into molecules17.0 mol H₂O x (6.022 x 1023 molecules H₂O/ 1 mol H₂O) = 1.02 x 1025 molecules H₂OThe subscripts that appear after the symbol representing an element can be interpreted as atoms ofthat element in one molecule of the compound1 molecule H₂O = 2 atoms H + 1 atom O = 3 atoms totalNow use this relationship to convert molecules can be converted into atoms1.02 x 1025 molecules H₂O x (3 atoms / 1 molecule H₂O) = 3.07 x 1025 atoms174 Units of Chemistry Study Assignment DScanned with CamScanner NAME:STUDY ASSIGNMENT D - Chemical Units of Quantitynote; Round all molar masses from the Periodic Table to two decimal places1. Convert the following quantities into moles1000.0 g Mga.b. 1000.0 g H₂Oc. 1000.0 g NaClC.d. 1000.0 g H₂2. Given 5.400 g of aluminum sulfateHow manya.moles of aluminum sulfate are there?b. How many moles of aluminum are there?DATE:How many moles of oxygen are there?Scanned with CamScanner

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1. Convert the following quantities into moles a. 1000.0 g Mg b. 1000.0 g H₂O c. 1000.0 g NaCl

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Concept explainers

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.

Question

The molar mass represents not a single atom or molecule but it represents Avogadro's number of
atoms or molecules. The formula CS, represents 76.15 g (1 mole) of carbon disulfide. The percentage
of sulfur by mass can be calculated as follows:
2S/1 CS₂ = (64.14 g S/76.15 g CS₂) x 100 = 84.22% S
The following are examples how the mole concept is applied
1. Mole to gram conversion
Determine the number of grams in 4.000 moles of H₂O
Molar mass of H₂O = (2 x 1.01) + (1 x 16.00) = 18.02 g/mol
1 mole H₂O = molar mass of H₂O = 18.02 grams H₂O
4.000 mol H₂O x (18.02 g H₂O/ 1 mol H₂O) = 72.08 grams H₂O
2. Gram to mole conversion
Determine the number of moles in 88.0 grams of CO₂
Molar mass of CO₂ = (1 x 12.01) + (2 x 16.00) = 44.01 g/mol
1 mole CO₂ = molar mass of CO₂ = 44.01 grams CO₂
88.0 g CO₂ x (1 mol CO₂ / 44.01 g CO₂) = 2.00 moles CO₂
3. Mole to molecule conversion
Determine the number of molecules of H₂O in 3.00 moles H₂O
1 mole H₂O = 6.022 x 1023 molecules H₂O
3.00 mol H₂O x (6.022 x 1023 molecules H₂O / 1 mol H₂O) = 1.81 x 10²4 molecules H₂O
4. Mole to atoms conversion
How many atoms are present in 17.0 moles of water?
In order to convert moles of a compound to atoms one must first convert moles into molecules
17.0 mol H₂O x (6.022 x 1023 molecules H₂O/ 1 mol H₂O) = 1.02 x 1025 molecules H₂O
The subscripts that appear after the symbol representing an element can be interpreted as atoms of
that element in one molecule of the compound
1 molecule H₂O = 2 atoms H + 1 atom O = 3 atoms total
Now use this relationship to convert molecules can be converted into atoms
1.02 x 1025 molecules H₂O x (3 atoms / 1 molecule H₂O) = 3.07 x 1025 atoms
174 Units of Chemistry Study Assignment D
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NAME:
STUDY ASSIGNMENT D - Chemical Units of Quantity
note; Round all molar masses from the Periodic Table to two decimal places
1. Convert the following quantities into moles
1000.0 g Mg
a.
b. 1000.0 g H₂O
c. 1000.0 g NaCl
C.
d. 1000.0 g H₂
2. Given 5.400 g of aluminum sulfate
How many
a.
moles of aluminum sulfate are there?
b. How many moles of aluminum are there?
DATE:
How many moles of oxygen are there?
Scanned with CamScanner

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