Question

1.4 × 10^13 molecules of H2-mol

1.5 × 10^14 atoms of He-mol
7.7 × 10^12 molecules of N2O-mol
3.0 × 10^12 molecules of CO-mol
The following quantities of trace gases were found in a 1 mL sample of air. Calculate the number of moles of each compound in the sample:

Answer 1

To calculate the number of moles for each compound in a sample, divide the number of molecules or atoms by Avogadro's number (6.022 x 10^23). Repeat this for each trace gas to find the respective number of moles.

Step-by-step explanation:

To calculate the number of moles of each compound in a sample, you should use Avogadro's number, which states that 1 mole of any substance contains exactly 6.022 x 1023 molecules or atoms. The mole is a standard unit of measurement in chemistry for expressing amounts of a chemical substance.

For each substance, divide the given number of molecules by Avogadro's number to find the number of moles. Here is a step-by-step example for H2:

• Determine the number of molecules, which is given as 1.4 x 1013.
• Use Avogadro's number (6.022 x 1023 molecules/mol) to convert molecules to moles.
• Divide the number of molecules by Avogadro's number: (1.4 x 1013 molecules) / (6.022 x 1023 molecules/mol) = 2.32 x 10-11 moles of H2.

Repeat this process for each compound to determine the number of moles.

Remember that molar mass and Avogadro's number are key concepts when performing these calculations.