The number of atoms in 1.2g of carbon - 12 isotope is

Assessment: WAEC SSCE - Chemistry - 1994 (Objective) Subject: Chemistry

Question 1 Report

The number of atoms in 1.2g of carbon - 12 isotope is
Answer Details
The first step to solving this problem is to determine the number of moles of carbon-12 present in 1.2g of the isotope. We do this by dividing the mass of the isotope by its molar mass. The molar mass of carbon-12 is 12 g/mol. Number of moles of carbon-12 = 1.2 g / 12 g/mol = 0.1 mol Since each mole of carbon-12 contains Avogadro's number of atoms (6.02 x 10^23), we can determine the number of atoms in 0.1 mol of carbon-12 as: Number of atoms = 0.1 mol x 6.02 x 10^23 atoms/mol = 6.02 x 10^22 atoms Therefore, the answer is 6.02 x 10^22.
Read lesson note on Atomic Structure And Bonding (JAMB)
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