Question

Find atoms of each element in
1) 7 molecules of CF2Cl2
2) 11 of moles of CF2Cl2
3) 181.5 gm of CF2CL2

Answer 1

1.) 7 molecules of CF2Cl2

no. of C atom = 1*7 =7 molecules

no. of F-atom =7*2 = 14 molecules

no. of Cl atom = 7*2 = 14 molecules

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2.) 11 of moles of CF2Cl2

no.of C atom = 11*1 = 11 moles

no. of F-atom = 11*2 =22 moles

no. of Cl atom= 11*2 =22 moles

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3.)181.5 gm of CF2CL2

no. of moles of CF2CL2 = Given mass / Molar mass

= 181.5÷ 133 = 1.36 moles

no. of C atom = 1.36*1 = 1.36 moles

no. of F-atom = 1.36*2 = 2.72 moles

no. of Cl atom= 1.36*2 = 2.72 moles

I hope you get it