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The value of Henry's Law constant in mol/l/kpa for O2 at this temperature. The atmospheric pressure is 1 atm ( the mole fraction of oxygen in air is 0.21)
Granite rock has a specific heat capacity of 0.80 J·°C-1·g-1. A 15 g rock was warmed by 202 J of energy from sunlight. What was the increase in temperature of the rock (in °C)?
Your chemiluminescence reaction will actually occur very slowly in air. What component of air will bring about this reaction and what is its approximate concentration in air?
Given the tabulated data, what is the lattice energy of crystalline calcium chloride?
A sample of an element has a volume of 81 mL and a density of 1.73 g/mL. What is the mass in grams of the sample (round to the nearest tenth)?
A solution containing 16.9 of a nonvolatile molecular compound in 250 g water has a freezing point of -0.744...What is the molar mass of the substance?
Reaction of NO with chlorine to yield NOCl is pseudo-first order if NO is present in a large excess. Determine the rate constant of this reaction if the partial pressure of NOCl increased from 0 to
Calculate the number of moles of N_2 dissolved per liter of blood, which is essentially an aqueous solution.
A 0.573g sample of nonvolatile solute is added to 15.6g of naphthalene and the mixture warmed until melted. The freezing point of the solute was determined and the found equal to 78.1 degress celsius.
The total volume of both metals is measured by the displacement of water to be 427cm^3 and the total mass is 4.36 kg . What percentage of the spheres are copper?
How many ounces would 12.30 moles of sulfur hexafluoride weigh?
A gas has a volume of 50.0 cm3 at a temperature of -73°C. What volume would the gas occupy at a temperature of -123 °C if the pressure stays constant?
Container Y is a 3 L container that contains 1.8 L of acetone. Both containers and contents are at 28 ? C. Which of the following is true?
Ethanol (C2H5OH) melts at -114°C. The enthalpy of fusion is 5.02 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/g·K and 2.3 J/g·K, respectively. How much heat (kJ) is needed t
In a 50.0 L container, 4.00 moles of chlorine and 2.00 moles of bromine are placed and kept at 293.0 K until equilibrium is reached. At equilibrium there are 82.63 g of Br2 (l). Determine the total
What is the appearance of the flame when the air intake is covered? What temperature does the thermometer read as you retrieve it from your drawer?
A weak acid (HA) is found to ionize 17.8% when mixed at a concentration of 0.3 mol/L. What is the value of Ka for this acid?
Consider a molecule with spacing between two energy levels of 0.250 kJ mol-1. Calculate the wavelength and wavenumber of the photon that would be needed to lead to an excitation between these two l
Small samples of oxygen gas needed in the laboratory can be generated by any number of simple chemical reactions, such as 2KClO3(s) 2 KCl(s) + 3 O2(g) According to this balanced chemical equation, h
If 7.00 mol calcium carbide (CaC2) reacts with an excess of water, how many moles of acetylene (C2H2) will be produced?
A first order reaction has k = 0.440 min-1 and the initial concentration of reactant is 0.840 M. What is the concentration of the reactant after 1.00 minute?
Lucite is 71.4% carbon, 9.59% hydrogen, and 19.01% oxygen. What is the empirical formula for Lucite?
The activation energy, Ea, for this reaction is 260 kJ/mol. At 800 K, the rate constant k = 0.0315 s-1. Determine the value of k at 850 K.
A sculptor has prepared a mold for casting a bronze figure. The figure has a volume of 245 mL. If bronze has a density of 7.8 rm {g/mL}, how many ounces of bronze are needed in the preparation of th
Hydrazine derivatives are commonly used in rocket fuels. Combustion of N2H4 produces N2(g) and H2O(g). When 1.00 g of N2H4 is burned in a bomb, DT = 3.51 oC. If C = 5.51 kJoC-1, what is the quantity o