Determine the number of moles in each substance. a. 3.25 x 1020 atoms of lead
b. 4.96 x 1024 molecules of glucose
c. 1.56 x 1023 formula units of sodium hydroxide
d. 1.25 x 1025 copper(ll) ions

The number of moles in lead is 5.40 × 10⁻⁴ moles

The number of moles in glucose is 8.24 moles

The number of moles in sodium hydroxide is 0.259 moles

The number of moles in copper (II) ions is 20.76 moles

The number of moles of a substance is equal to 6.022 × 10²³ atoms. The number of moles of each given substance can be calculated by relating it to the Avogadro's constant 6.022 × 10²³ atoms.

Starting with a from the given parameters, we have:

Making x the subject of the formula, we have:

x = 5.40 × 10⁻⁴ moles

x = 8.24 moles

x = 0.259 moles

x = 20.76 moles

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a) 5.4 * 10^-4 moles

b) 8.2 moles

c) 0.26 moles

d) 20.76 moles

Explanation:

a)Since 1 mole of a substance has 6.02 * 10^23 atoms

x moles is present in  3.25 x 1020 atoms of lead

3.25 x 1020 atoms of lead/6.02 * 10^23 atoms = 5.4 * 10^-4 moles

b) Since 1 mole of a substance has 6.02 * 10^23 molecules

x moles is present in  4.96 x 1024 molecules of glucose

x = 4.96 x 1024 molecules of glucose/6.02 * 10^23 molecules = 8.2 moles

c) Since 1 mole of a substance has 6.02 * 10^23 formula units

x moles is present in 1.56 x 1023 formula units of sodium hydroxide

x =  1.56 x 1023 formula units /6.02 * 10^23 = 0.26 moles

d) Since 1 mole of a substance has 6.02 * 10^23 ions

x moles is present in 1.25 x 1025 copper(ll) ions

x = 1.25 x 1025 copper(ll) ions/6.02 * 10^23 ions = 20.76 moles