Chapter 14 Review

Which of the substances below is the LEAST toxic?

• Cola (LD50 = 140mg/kg)
• Aspirin (LD50 = 200mg/kg)
• Chlorine (LD50 = 850 mg/kg)
• Vitamin A (LD50 = 2000 mg/kg)

How many grams of sugar (LD50 = 30 g/kg) would be lethal to a 220 lb woman (2.2 lb = 1 kg)?

• 6600 g
• 3000 g
• 0.30 g
• 0.13 g

Jake measures the weight of one bottle cap as 5.03 grams, so he calculates that the weight of 100 bottle caps will be 503 grams.  The actual weight of 100 bottle caps is 495 grams.  What is Jake's percent error?

• 0.16%
• 1.6%
• 4.0%
• 8.0%

How many atoms are there in 1 mole of CO₂?

• 1.81 x 10²³ atoms
• 1.81 x 10²⁴ atoms
• 6.02 x 10²³ atoms
• 6.02 x 10²⁴ atoms

The adult LD50 for aspirin is 400 mg/kg.  How many 250-mg aspirin tablets would a 175-pound person need to consume to get a lethal dose? (1 kg = 2.2 lb)

• 280
• 241
• 127
• 50

What is the molar mass for ammonium phosphate: (NH₄)₃PO₄

• 113.0 g/mol
• 121.0 g/mol
• 149.0 g/mol
• 242.0 g/mol

How many moles of potassium iodide (KI), are there in 50 grams?

• 166 mol
• 3.32 mol
• 2.20 mol
• 0.30 mol

Which of these materials has the most moles of metal atoms?

• 100 g of iron, Fe
• 100 g iron (II) oxide, FeO
• 100 g potassium chloride, KCl
• 100 g potassium, K

How many grams of alumnium are contained in 100.0 g of aluminum chloride, AlCl₃?

• 18.6 g
• 20.2 g
• 25.0 g
• 41.5 g

If you have 1.0 mol of each of the following compounds, which will have the greatest mass?

• H₃PO₄
• KCl
• FeCl₃
• NI₃