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Find the molar mass of the compounds:

a) Al: 27.0 g/mol
b) Al₂(SO₄)₃: 342.2 g/mol
c) H₂SO₄: 98.1 g/mol
d) H₂: 2.0 g/mol

Answer :

Final answer:

a) The molar mass of Al is 26.98 g/mol. b) The molar mass of Al2(SO4)3 is 342.2 g/mol. c) The molar mass of H2(SO4) is 98.1 g/mol. d) The molar mass of H2 is 2.0 g/mol.

Explanation:

a. One mole of Al atoms has a mass in grams that is numerically equivalent to the atomic mass of aluminum. The periodic table shows that the atomic mass (rounded to two decimal points) of Al is 26.98, so 1 mol of Al atoms has a mass of 26.98 g.

b. According to the periodic table, 1 mol of U has a mass of 238.0 g, so the mass of 2 mol is twice that, or 476.0 g.

c. The compound H2(SO4) has a molar mass of 98.1 g/mol. The molar mass is calculated by adding up the atomic masses of each element in the formula:

(2 x atomic mass of H) + atomic mass of S + (4 x atomic mass of O)

(2 x 1.0 g/mol) + 32.1 g/mol + (4 x 16.0 g/mol) = 98.1 g/mol.

d. The molar mass of H2 is calculated by adding up the atomic masses of each element in the formula:

2 x atomic mass of H = 2 x 1.0 g/mol = 2.0 g/mol.

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