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Chapter 3: Q.25E (page 129)

Determine which of the following contains the greatest mass of aluminum: 122 g of AlPO4, 266 g of Al2C16, or 225 g of Al2S3.

Short Answer

Expert verified

Greatest mass of Al is in Al2S3 = 81 g.

Step by step solution

01

Determine the number of moles

Given

122 g of AlPO4

266 g of Al2C16

225 g of Al2S3

Molar mass of AlPO4 = 2 x 27 + 16 x 12 = 246 g/mol

Molar mass Al2C16= 27 + 31+ 4 x 16 = 122 g/mol

Molar mass Al2S3= 2 x 27 + 3 x 32 = 150 g/mol

Number of mole of AlPO4 = (122 g) / (122 g/mol) = 1 mol AlPO4

Number of mole of Al2C16 = (266 g)/(246 g/mol) = 1.081 mol of Al2C16

Number of mole of Al2S3 = (225 g)/(150 g/mol) = 1.5 mol of Al2S3

02

Determine the mass

Mass of Al in AlPO4 = 1 mol x 27 g/mol = 27 g

Mass of Al in Al2C16 = 1.081 mol x 54 g/mol = 58.374 g

Mass of Al in Al2S3 = 1.5 mol x 54 g /mol = 81 g

Greatest mass of Al is in Al2S3

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Most popular questions from this chapter

Determine the number of moles of compound and the number of moles of each type of atom in each of the following:

(a) 25.0 g of propylene, C3H6

(b) 3.06×10−3 g of the amino acid glycine, C2H5NO2

(c) 25 lb of the herbicide Treflan, C13H16N2O4F (1 lb = 454 g)

(d) 0.125 kg of the insecticide Paris Green, Cu4(AsO3)2(CH3CO2)2

(e) 325 mg of aspirin, C6H4(CO2H) (CO2CH3)

A 24.81-g sample of a gaseous compound containing only carbon, oxygen, and chlorine is determined to contain 3.01 g C, 4.00 g O, and 17.81 g Cl. What is this compound’s percent composition?

For each of the following pairs of ions, write the symbol for the formula of the compound they will form:

  1. \({K^ + },{O^{2 - }}\)
  2. \(NH_4^ + ,PO_4^{3 - }\)
  3. \(A{l^{3 + }},{O^{2 - }}\)
  4. \(N{a^ + },CO_3^{2 - }\)
  5. \(B{a^{2 + }},PO_4^{3 - }\)

What is the concentration of the NaCl solution that results when 0.150 L of a 0.556-M solution is allowed to evaporate until the volume is reduced to 0.105 L?

Find the molarity of 40.0% by the mass aqueous solution of sulphuric acid H2SO4 for which the density is 1.3057g/ml.
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