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What is the value of the equilibrium constant at 500 °C for the formation of NH  3 according to the following equation?

N2(g) + 3H2(g) ⇌ 2NH3(g)

An equilibrium mixture of NH3(g), H2(g), and N2(g) at 500 °C was found to contain 1.35 M H 2, 1.15 M N2, and 4.12 × 10−1 M NH3.

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Convert the values of Kc to values of KP or the values of KP to values of Kc.

(a) Cl2(g) + Br2(g) ⇌ 2BrCl(g)              K c = 4.7 × 10−2 at 25 °C

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Barium crystallizes in a body-centered cubic unit cell with an edge length of 5.025 Å

(b) Calculate the density of barium.

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What is the freezing temperature of a solution of 115.0 g of sucrose, C 12H22O11, in 350.0 g of water, which freezes at 0.0 °C when pure?

(a) Outline the steps necessary to answer the question.

(b) Answer the question.

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At 0 °C and 1.00 atm, as much as 0.70 g of O can dissolve in 1 L of water. At 0 °C and 4.00 atm, how many grams of O2 dissolve in 1 L of water?

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Which of the period 2 homonuclear diatomic molecules are predicted to be paramagnetic?

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Is the Cl2BBCl2 molecule polar or nonpolar?

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Write a Lewis structure for BF4 .

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Identify the more polar bond in the following pair of bonds: HF or HCl.

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Photons of infrared radiation are responsible for much of the warmth we feel when holding our hands before a fire. These photons will also warm other objects. How many infrared photons with a wavelength of 1.5 × 10−6 m must be absorbed by the water to warm a cup of water (175 g) from 25.0 °C to 40 °C?

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What is the limiting reactant when 1.50 g of lithium and 1.50 g of nitrogen combine to form lithium nitride, a component of advanced batteries, according to the following unbalanced equation?

Li + N2 ⟶ Li3N

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A mordant is a substance that combines with a dye to produce a stable fixed color in a dyed fabric. Calcium acetate is used as a mordant. It is prepared by the reaction of acetic acid with calcium hydroxide.

2CH3CO2 H + Ca(OH)2 ⟶ Ca(CH3CO2)2 + 2H2O

What mass of Ca(OH)2 is required to react with the acetic acid in 25.0 mL of a solution having a density of 1.065 g/mL and containing 58.0% acetic acid by mass?

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Balance the following equations:

(a) PCl5(s) + H2O(l) ⟶ POCl3(l) + HCl(aq)


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A throat spray is 1.40% by mass phenol, C6H5OH, in water. If the solution has a density of 0.9956 g/mL, calculate the molarity of the solution.

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A 55-kg woman has 7.5 × 10−3 mol of hemoglobin (molar mass = 64,456 g/mol) in her blood. How many hemoglobin molecules is this? What is this quantity in grams?

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Calculate the molar mass of each of the following compounds:
(d) silver sulfate, Ag2SO4 

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Many chemistry conferences have held a 50-Trillion Angstrom Run (two significant figures). How long is this run in kilometers and in miles? (1 Å = 1 × 10−10 m)

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A very good 197-lb weight lifter lifted 192 kg in a move called the clean and jerk. What was the mass of the weight lifted in pounds?

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Write conversion factors (as ratios) for the number of:

(a) kilometers in 1 mile

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