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The boiling point of ethanol (C2H5OH) is 78.5°C. What is the boiling point of a solution of 6.4 g of vanillin (ℳ = 152.14 g/mol) in 50.0 g of ethanol (Kb of ethanol = 1.22°C/m)?

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How many moles of solute particles are present in 1 mL of each of the following aqueous solutions?
 
(c) 0.08 M pyridine (C5H5N)

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An automobile antifreeze mixture is made by mixing equal volumes of ethylene glycol (d = 1.114 g/mL; ℳ = 62.07 g/mol) and water (d = 1.00 g/mL) at 20°C. The density of the mixture is 1.070 g/mL. Express the concentration of ethylene glycol as:

(c) Molarity

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Argon makes up 0.93% by volume of air. Calculate its solubility (mol/L) in water at 20°C and 1.0 atm. The Henry’s law constant for Ar under these conditions is 1.5×10–3 mol/L·atm.

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Bismuth is used to calibrate instruments employed in high-pressure studies because it has several well-characterized crystalline phases. Its phase diagram (below) shows the liquid phase and five solid phases that are stable above 1 katm (1000 atm) and up to 300°C. Which phase is stable at 50 katm and 175°C?

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Draw a Lewis structure for 

(c) SbH3

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Draw a Lewis structure for 

(a) SiF4


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Consider the following balanced thermochemical equation for the decomposition of the mineral magnesite:

MgCO3 (s) ⟶ MgO (s) + CO2 (g)                         ΔH = 117.3 kJ

What is ΔH for the reverse reaction?

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Chromium(III) oxide reacts with hydrogen sulfide (H2S) gas to form chromium(III) sulfide and water: 

Cr2O3(s) + 3H2S(g) ⟶Cr2S3(s) + 3H2O(l) 

To produce 421 g of Cr2S3, how many moles of Cr2Oare required?

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Bismuth oxide reacts with carbon to form bismuth metal: 

Bi 2O3(s) + 3C(s) ⟶2Bi(s) + 3CO(g) 

When 0.607 mol of Bi2Oreacts with excess carbon, how many grams of CO form?

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How many grams of potassium chlorate decompose to potassium chloride and 638 mL of O2 at 128°C and 752 torr?

2 KClO3(s) ⟶2 KCl(s) + 3 O2(g)

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Give the oxidation number of sulfur in each of the following:

 H2S2

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A chloride of silicon contains 79.1 mass % Cl. If the molar mass is 269 g/mol, what is the molecular formula?

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How many total moles of ions are released when each of the following dissolves in water?

3.55×1019 formula units of LiCl

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What monatomic ions would you expect potassium (Z = 19) and bromine (Z = 35) to form?

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The area of a telescope lens is 7903 mm 2. What is the area in square feet (ft 2)? 

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