Question

How many moles of atoms are in 9.00 g of 13c?

Answer 1

To determine the number of moles of atoms in 9.00 g of 13C, you divide the mass of the sample by its molar mass, which gives you approximately 0.692 moles of 13C atoms.

Step-by-step explanation:

To calculate the number of moles of atoms in 9.00 g of 13C, you utilize the concept that a mole represents a specific number of particles, typically atoms or molecules. By definition, one mole of carbon-12 (12C) has a mass of exactly 12 g and consists of 6.022 × 1023 atoms. Although you're dealing with carbon-13 (13C), we can use similar reasoning. The mass of one mole of 13C is slightly greater than 12C due to the extra neutron, and it's approximately 13 g/mol (reflecting its atomic mass).

To find out how many moles are in 9.00 g of 13C, you'd perform the following calculation:

Number of moles = mass of sample (in grams) / molar mass (in g/mol)

For 9.00 g of 13C: Number of moles = 9.00 g / 13 g/mol

This gives you approximately 0.692 moles of 13C atoms.

Answer 2

The atomic weight of 13C should be pretty close to 13.0. (If you have the exact mass, use it in the problem.) So, 9.00 g / 13.0 g/mol = 0.692 moles Therefore, the answer should be 0.692 moles are in 9.00 g of 13C.