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

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o