Consider the compound Pb (SO4) 2 and answer the following questions: What is the name of this compound? What is the molar mass of this compound? Explain how you calculated this value.

Question

Chemistry

Leroy Mclean

27 May, 22:10

Consider the compound Pb (SO4) 2 and answer the following questions: What is the name of this compound? What is the molar mass of this compound? Explain how you calculated this value.

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Alessandra Richardson · Answer 1

Pb (SO₄) ₂

This element is lead (IV) sulfate. Lead is a multivalent ion. But we know that sulfate ions, SO₄²⁻, have a charge of - 2. In order to have the ratios match up, we need Pb⁴⁺ (two times as many Pb⁴⁺ than SO₄²⁻).

The molar mass can be calculated by finding the mass of one mole of this compound. Consider the following calculation, where amu represents the atomic mass unit. The amu for each atom involved in this compound can be found on a periodic table.

molar mass = amu Pb + 2 (amu S + 4 * amu O)

From a periodic table (with masses rounded to the nearest tenth),

amu Pb = 207.2 g

amu S = 32.1 g

amu O = 16.0 g

Therefore

molar mass = 207.2 + 2 (32.1 + 4*16.0) = 399.4 g

The molar mass is therefore 399.4 grams per mol