An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
One mole of any substance contains Avogadro's number of particles.
Avogadro's number is approximately 6.02 × 1 0 23 .
Therefore, 1 mole of sodium contains 6.02 × 1 0 23 atoms.
The answer is 6.02 × 1 0 23 atoms .
Explanation
Understanding the Problem We are asked to find the number of atoms in 1 mole of sodium (Na). We know that one mole of any substance contains Avogadro's number of atoms, molecules, or ions. Avogadro's number is approximately 6.022 × 1 0 23 . Therefore, 1 mole of sodium contains Avogadro's number of sodium atoms.
Avogadro's Number Avogadro's number is a fundamental constant in chemistry that defines the number of constituent particles (atoms, molecules, ions, etc.) that are contained in one mole of a substance. Its value is approximately 6.022 × 1 0 23 .
Applying Avogadro's Number to Sodium Since 1 mole of any substance contains Avogadro's number of particles, 1 mole of sodium (Na) contains 6.022 × 1 0 23 atoms.
Final Answer Therefore, the number of atoms in 1 mole of sodium is 6.02 × 1 0 23 atoms.
Examples
Imagine you're baking cookies and a recipe calls for 1 mole of sugar. Just like 1 mole of sodium contains 6.022 × 1 0 23 atoms, 1 mole of sugar contains 6.022 × 1 0 23 sugar molecules. This concept helps chemists and bakers alike to measure and combine ingredients accurately, ensuring consistent results whether you're synthesizing a new compound or baking your favorite treat.
Approximately 2.81 × 1 0 21 electrons flow through the device that delivers a current of 15.0 A for 30 seconds. This is calculated by first determining the total charge in coulombs using the current and time, and then converting that charge into the number of electrons based on the charge of a single electron.
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