Chapter 7 – Review
7.1 The Mole Concept and Avogadro’s Number; and 7.2 Molecular Mass, Avogadro’s Number and The Mole
- What is the total mass (amu and g/mol) of carbon in each of the following molecules?
- CH4
- CHCl3
- C12H10O6
- CH3CH2CH2CH2CH3
Check Answer: [1]
- What is the total mass (amu and g/mol) of hydrogen in each of the molecules?
- CH4
- CHCl3
- C12H10O6
- CH3CH2CH2CH2CH3
- Calculate the molecular or formula mass and molar mass of each of the following:
- P4
- H2O
- Ca(NO3)2
- CH3CO2H (acetic acid)
- C12H22O11 (sucrose, cane sugar).
Check Answer: [2]
- Determine the molecular mass and molar mass of the following compounds:
(a)
(b)
(c)
(d)
- Determine the molecular mass and molar mass of the following compounds: Check Answer: [3]
(a)
(b)
(c)
(d)
- Which molecule has a molecular mass of 28.05 amu?
(a)
(b)
(c)
- Write a sentence that describes how to determine the number of moles of a compound in a known mass of the compound if we know its molecular formula. Check Answer: [4]
- Compare 1 mole of H2, 1 mole of O2, and 1 mole of F2.
- Which has the largest number of molecules? Explain why.
- Which has the greatest mass? Explain why.
- Which contains the greatest mass of oxygen: 0.75 mol of ethanol (C2H5OH), 0.60 mol of formic acid (HCO2H), or 1.0 mol of water (H2O)? Explain why. Check Answer: [5]
- Which contains the greatest number of moles of oxygen atoms: 1 mol of ethanol (C2H5OH), 1 mol of formic acid (HCO2H), or 1 mol of water (H2O)? Explain why.
- How are the molecular mass and the molar mass of a compound similar and how are they different? Check Answer: [6]
- Calculate the molar mass of each of the following compounds:
- hydrogen fluoride, HF
- ammonia, NH3
- nitric acid, HNO3
- silver sulfate, Ag2SO4
- boric acid, B(OH)3
- Calculate the molar mass of each of the following:
- S8
- C5H12
- Sc2(SO4)3
- CH3COCH3 (acetone)
- C6H12O6 (glucose)
Check Answer: [7]
- Calculate the empirical or molecular formula mass and the molar mass of each of the following minerals:
- limestone, CaCO3
- halite, NaCl
- beryl, Be3Al2Si6O18
- malachite, Cu2(OH)2CO3
- turquoise, CuAl6(PO4)4(OH)8(H2O)4
- Calculate the molar mass of each of the following:
- the anesthetic halothane, C2HBrClF3
- the herbicide paraquat, C12H14N2Cl2
- caffeine, C8H10N4O2
- urea, CO(NH2)2
- a typical soap, C17H35CO2Na
Check Answer: [8]
- Determine the number of moles of compound and the number of moles of each type of atom in each of the following:
- 25.0 g of propylene, C3H6
- 3.06 × 10−3 g of the amino acid glycine, C2H5NO2
- 25 lb of the herbicide Treflan, C13H16N2O4F (1 lb = 454 g)
- 0.125 kg of the insecticide Paris Green, Cu4(AsO3)2(CH3CO2)2
- 325 mg of aspirin, C6H4(CO2H)(CO2CH3)
- Determine the mass of each of the following:
- 0.0146 mol KOH
- 10.2 mol ethane, C2H6
- 1.6 × 10−3 mol Na2 SO4
- 6.854 × 103 mol glucose, C6 H12 O6
- 2.86 mol Co(NH3)6Cl3
Check Answer: [9]
- Determine the number of moles of the compound and determine the number of moles of each type of atom in e