What is the mass, in grams, of 2.50 * 10-3 mol of aluminum sulfate?

a. 0.855 g

b. 123.04 g

c. 85.54 g

d. 342.14 g

e. 1368 g

The mass is 0.855 grams (option A)

Explanation:

Step 1: Data given

aluminium sulfate = Al2 (SO4) 3

Numer of moles Al2 (SO4) 3 = 2.50 * 10^-3 moles

atomic mass Al = 26.99 g/mol

atomic mass S = 32.065 g/mol

Atomic mass O = 16 g/mol

Step 2: Calculate molar mass Al2 (SO4) 3

Molar mass = 2 * 26.99 + 3*32.065 + 12*16

Molar mas = 342.175 g/mol

Step 3: Calculate mass Al2 (SO4) 3

Mass Al2 (SO4) 3 = moles Al2 (SO4) 3 * molar mass Al2 (SO4) 3

Mass Al2 (SO4) 3 = 2.5 * 10^-3 moles * 342.175 g/mol

Mass Al2 (SO4) 3 = 0.855 grams

The mass is 0.855 grams (option A)