Question

calculate the no. of molecules in following

1. 240g of CH4
2.136g of h2s

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Answer 1

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Answer 2

Answers:

1. 9.033 × 10²⁴ molecules

2. 2.4088 × 10²⁴ molecules

Explanations:

Number One:

Calculate the atomic weight of methane (CH₄):

         C = 12g, H = 1g

         CH₄ = 12 + (1 × 4)

                 = 12 + 4

                 = 16g

     ∴ 1 mole of CH₄ = 16g

Calculate how many moles there are in the amount given:

         1 mole of CH₄ = 16g

      ∴ Number of moles in 240g = $\frac{240}{16}$

                                                     = 15mol

Calculate the number of molecules in the amount of moles previously calculated:

         1 mole of CH₄ contains 6.022 × 10²³ molecules

     ∴  15mol = 15 × 6.022 × 10²³

                    = 9.033 × 10²⁴ molecules

Number two:

Calculate the atomic weight of hydrogen sulfide (H₂S):

         S = 32g, H = 1g

         H₂S = 32 + (1 × 2)

                 = 32 + 2

                 = 34g

     ∴ 1 mole of H₂S = 34g

Calculate how many moles there are in the amount given:

         1 mole of H₂S = 34g

      ∴ Number of moles in 136g = $\frac{136}{34}$

                                                     = 4mol

Calculate the number of molecules in the amount of moles previously calculated:

         1 mole of H₂S contains 6.022 × 10²³ molecules

     ∴  4mol = 4 × 6.022 × 10²³

                    = 2.4088 × 10²⁴ molecules

                                                                                       Hope this helps! :)

                                                                                                     - Abby <3