Chemistry Homework Help

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Jun 10th, 2015

Thank you for the opportunity to help you with your question!

A. n=m/M so m=n*M=(N/Na)*M with Na Avogadro Constant

m=(7.5*10^15)/(6.022*10^23)*58.69=7.31.10^(-7) g

B. m=(N/Na)*M  so N=m*Na/M (M=9*12+8+4*16=180 g/mol)

N=0.1*6.022*10^23/180=3.35*10^20 molecules

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 10th, 2015

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