 Science
Worksheet for elements, chemistry homework help

### Question Description

Need help with my Chemistry question - I’m studying for my class.  Student has agreed that all tutoring, explanations, and answers provided by the tutor will be used to help in the learning process and in accordance with Studypool's honor code & terms of service. 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=1.2044 *10^24 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)
Boston College Anonymous
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