How many moles of mercury are 4.000 x 1022 atoms of mercury?

0.06642 moles of mercury

Explanation:

Step 1: Given data

Moles of mercury: 4.000 × 10²² atoms

Step 2: Calculate the number of moles of mercury that correspond to 4.000 × 10²² atoms of mercury

To convert atoms to moles, we need to consider the Avogadro's number: there are 6.022 × 10²³ atoms of mercury per mole of mercury.

4.000 × 10²² atoms × (1 mol/6.022 × 10²³ atoms) = 0.06642 mol

See explanation and image attached

Explanation:

We were told that one of two different oxidizing agents were used H2CrO4 and H2SO4 or PCC/CH2Cl2.

Now, we must know that when we use H2CrO4 and H2SO4, primary alcohols are converted to aldehydes and then to carboxylic acids while secondary alcohols are converted to ketones.

When we use PCC/CH2Cl2 primary alcohols are converted to aldehydes and does not move further to convert to carboxylic acids while secondary alcohols are converted to ketones.

Recall that tertiary alcohols are not oxidized at all.