This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Here are the solutions to Activity 2.5: Trial Questions. To solve these problems, we use the relationship between the number of moles (n), the number of particles (N), and Avogadro's number (N_A). Avogadro's number is approximately 6.022 × 10^23 particles per mole. The formula is: n = (N)/(N_A) 1) How many moles are there in 1.204 × 10^24 molecules of water (H_2O)? Step 1: Identify the given values. Number of molecules (N) = 1.204 × 10^24 molecules. Avogadro's number (N_A) = 6.022 × 10^23 molecules/mol. Step 2: Apply the formula to find the number of moles. n = (N)/(N_A) n = 1.204 × 10^24 molecules6.022 × 10^23 molecules/mol Step 3: Calculate the number of moles. n = 1.999335768847558 mol Rounding to three significant figures: n ≈ 2.00 mol The number of moles is 2.00 mol. 2) Calculate the number of moles in 3.011 × 10^22 atoms of helium (He). Step 1: Identify the given values. Number of atoms (N) = 3.011 × 10^22 atoms. Avogadro's number (N_A) = 6.022 × 10^23 atoms/mol. Step 2: Apply the formula to find the number of moles. n = (N)/(N_A) n = 3.011 × 10^22 atoms6.022 × 10^23 atoms/mol Step 3: Calculate the number of moles. n = 0.049999999999999996 mol Rounding to three significant figures: n ≈ 0.0500 mol The number of moles is 0.0500 mol. 3) If you have 5.000 × 10^23 molecules of carbon dioxide (CO_2), how many moles do you have? Step 1: Identify the given values. Number of molecules (N) = 5.000 × 10^23 molecules. Avogadro's number (N_A) = 6.022 × 10^23 molecules/mol. Step 2: Apply the formula to find the number of moles. n = (N)/(N_A) n = 5.000 × 10^23 molecules6.022 × 10^23 molecules/mol Step 3: Calculate the number of moles. n = 0.8302889405513118 mol Rounding to four significant figures: n ≈ 0.8303 mol The number of moles is 0.8303 mol. Send me the next one 📸