 # Which of the following represents the mass of 1 molecule of SH2?

## Answers Answer:             5.645 × 10⁻²³ g Solution: Step 1) Calculate Molar Mass of SH₂; Atomic Mass of Sulfur    =  32 g/mol Atomic Mass of H₂         =  2 g/mol                                       -------------------- Molecular Mass of SH₂  =  34 g/mol Step 2: Calculate mass of one molecule of SH₂ as; As,                      Moles  =  # of Molecules / 6.022 × 10²³ Also, Moles  =  Mass / M.Mass So,                      Mass/M.mass  =  # of Molecules / 6.022 × 10²³ Solving for Mass,                      Mass  = # of Molecules × M.mass / 6.022 × 10²³ Putting values,                      Mass  =  (1 Molecule × 34 g.mol⁻¹) ÷ 6.022 × 10²³                      Mass  =  5.645 × 10⁻²³ g

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