What is the value of the equilibrium constant at 500 °C for the formation of NH3 according to the following equation?
N2(g) + 3 H2(g) ⇌ 2 NH3(g)
An equilibrium mixture of NH3(g), H2(g), and N2(g) at 500 °C was found to contain 1.35 M H2, 1.15 M N2, and 4.12 × 10−1 M NH3.
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
Barium crystallizes in a body-centered cubic unit cell with an edge length of 5.025 Å
(b) Calculate the density of barium.
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.
At 0 °C and 1.00 atm, as much as 0.70 g of O 2 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?
Which of the period 2 homonuclear diatomic molecules are predicted to be paramagnetic?
Is the Cl2BBCl2 molecule polar or nonpolar?
Write a Lewis structure for BF4 –.
Identify the more polar bond in the following pair of bonds: HF or HCl.
Write the electron configuration for Sn2+.
Write the electron configuration for O2–.
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?
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
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?
Balance the following equations:
(a) PCl5(s) + H2O(l) ⟶ POCl3(l) + HCl(aq)
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.
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?
Calculate the molar mass of each of the following compounds:
(d) silver sulfate, Ag2SO4
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)
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?
The distance between the centers of the two oxygen atoms in an oxygen molecule is 1.21 × 10−8 cm. What is this distance in inches?