Question

Which of the following samples contains the greatest number of atoms?

a. 9 mole of CO2 b. 10 moles of Xe
c. 11 moles of N2O d. 12 moles of CO

Answer 1

To determine which sample contains the greatest number of atoms, we need to calculate the number of moles for each sample and then multiply it by Avogadro's number. The sample with the greatest number of atoms is 12 moles of CO.

Step-by-step explanation:

In order to determine which sample contains the greatest number of atoms, we need to consider Avogadro's number. Avogadro's number, denoted as NA, is the number of molecules in a mole of a substance. It is approximately equal to 6.022 × 10^23. In this case, we need to calculate the number of moles for each sample and then multiply it by Avogadro's number to find the number of atoms:

a. 9 moles of CO₂: 9 x (6.022 × 10²³) atoms of CO₂ = 54.198 × 10²³

b. 10 moles of Xe: 10 x (6.022 × 10²³) atoms of Xe = 60.22 × 10²³

c. 11 moles of N₂O: 11 x (6.022 × 10²³) atoms of N₂O = 66.242 × 10²³

d. 12 moles of CO: 12 x (6.022 × 10²³) atoms of CO = 72.264 × 10²³

Therefore, the sample with the greatest number of atoms is 12 moles of CO.

Answer 2

C. 11 moles of N2O

Step-by-step explanation:

A. CO2 exists as a molecular compound. The number of atoms present = 1 atom of Carbon and 2 atoms oxygen = 3 atoms * 9 = 18 atoms

B. Xe exists as an atom. Number of atoms present = 10 * 1 atom = 10 atoms

C. N20 contains 3 atoms; 2 atoms of Nitrogen and 1 atom of oxygen.

Number of atoms present = 3 * 11 = 33 atoms

D. CO contains 2 atoms, 1 each of carbon and oxygen.

Number of atoms present = 12 * 2 = 24 atoms