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6.02x10²³

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2. How many atoms are in 1 mole of any element

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2. How many atoms are in 1 mole of any element

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6.02x10²³

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K=78.2 C=12 O=48
138.2 g/mol

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Ag=107.9 N=14 O=48
164.8 g/mol

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5. What is the molar mass of Iron(II) phosphate, Fe(PO4)2? 

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5. What is the molar mass of Iron(II) phosphate, Fe(PO4)2? 

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Fe=167.4 2 P=31 O=48
357.4 g/mol

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6) How many atoms are in one mole of hydrogen?

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6) How many atoms are in one mole of hydrogen?

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6.02*10²³ hydrogen atoms

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7) What is the number of moles in 55.8 grams of Fe?

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7) What is the number of moles in 55.8 grams of Fe?

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Fe = 55.8g
55.8g     1 mol   =    1 mol of Fe
1             55.8g

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8) Calculate the number of grams in 0.250 moles of NaCl.

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8) Calculate the number of grams in 0.250 moles of NaCl.

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Na = 23g                                0.250 mol   58.5g    =  14.625g of NaCl
Cl = 35.5g                                     1            1 mol
Therefore, NaCl = 58.5g

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12g of C

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6.02x10^23

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11)    The chemical formula of water is H20. What is the mass of 0.200 moles of water?

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11)    The chemical formula of water is H20. What is the mass of 0.200 moles of water?

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H=2.0                                 0.200mol       18g

O=16.0                                                                     =3.6g of H20
1               1mole

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720 mol    137.3g           = 98.856
1              1 mole

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13.  Caculate the number of moles of MgCl2 that are in 5.0 grams MgCl2

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13.  Caculate the number of moles of MgCl2 that are in 5.0 grams MgCl2

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5.0      1 mol  = 0.052
1 95.3

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14. How many atoms are present i n 0.856 mol of Au

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14. How many atoms are present i n 0.856 mol of Au

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0.856       6.02*10²³ = 5.15*10²³
1              1 mole

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15. What is the percent coposition of Oxygen in acetone, C₃H₆O

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15. What is the percent coposition of Oxygen in acetone, C₃H₆O

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C= 12*3          16 ➗ 58  *  100 = 27%
H= 6
O=16