How many C₂H₄ molecules are contained in 45.8 mg of C₂H₄? The molar mass of C₂H₄ is 28.05 g mol^-1.

Question

Quizplus · Accepted Answer

First, convert 45.8 mg to grams: 45.8 mg = 0.0458 g. Then, calculate the number of moles of C₂H₄: 0.0458 g / 28.05 g/mol = 0.001632 moles. Finally, multiply by Avogadro's number (6.022 × 10²³) to find the number of molecules: 0.001632 moles × 6.022 × 10²³ molecules/mol = 9.83 × 10²⁰ molecules.

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