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Finding mass , moles and atoms, chemistry homework help

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1)  Cu , moles = 2.00

Mass in grams = moles * molar mass Cu = 2 moles * 63.546 g /mol = 127.092 g

# atoms = (6.022 *10^23 atoms / 1mole ) *2mole = 12.044 *10^23 atoms

2 )  S  , moles = mass in g /molar mass S = 64.24 /32.065 = 2.00 moles

# atoms = (6.022 *10^23 atoms / 1mole ) *2mole = 12.044 *10^23 atoms = 1.2044 *10^24 atoms

3) CaF2 ,  Mass in grams = moles * molar mass Cu = 1moles * 78.07g /mol = 78.07 g

# atoms = (6.022 *10^23 atoms / 1mole ) *1mole =6.022 *10^23 atoms

4) Be , moles = mass in g /molar mass Be = 44.00 /9.01= 5 moles

# atoms = (6.022 *10^23 atoms / 1mole ) *5mole= 30.11 *10^23 = 3.011 *10^24 atoms

5) CO2 ,  , moles = mass in g /molar mass Be =100.00 /12.010 = 8.3 moles

# atoms = (6.022 *10^23 atoms / 1mole ) *8.3 mole= 49.9*10^23 = 4.99 *10^24 atoms= 5.0*10^24atoms

6) H2O2 no values given ???

6) RbCl

# atoms = (6.022 *10^23 atoms / 1mole ) *2.20mole = 13.24*10^23 atoms = 1.324 *10^24atoms

7) BaCl2 , moles = mass in g /molar mass Be =200/ 208.3 = = 0.96moles

# atoms = (6.022 *10^23 atoms / 1mole ) *0.96= 5.78 *10^23 atoms

sumitsans (23)
New York University
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