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Please solve problem ,and show each step worked out!

51 Determine the mass in grams of each of the following: (a) 0.600 mol of oxygen atoms (b) 0.600nmol of oxygen molecules, O2 (c)n0.600 mol of ozone molecules, O3.

Explain why the symbol for an atom of the element oxygen and the formula for a molecule of oxygen differ.

Chapter 2, Question 61: Which of the following represents the least number of molecules?

(a) \f$20.0g\f$ of  \f$H_{2}O\f$ (18.02 g/mol)

(b) \f$77.0g\f$ of  \f$CH_{4}\f$(16.06 g/mol)

(c) \f$68.0g\f$ of \f$CaH_{2}\f$(42.09 g/mol)

(d) \f$100.0g\f$ of \f$N_{2}O\f$ (44.02 g/mol)

(e) \f$84.0g\f$ of \f$HF\f$(20.01 g/mol)