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What are (a) the energy, (b) the momentum, and (c) the wavelength of the photon that is emitted when a hydrogen atom undergoes a transition from the state n = 3 to n = 1?
The complete combustion of octane, C8H18, the main component of gasoline, proceeds as follows. How many moles of O2 are needed to burn 1.50 mol of C8H18?
One mole of an ideal diatomic gas is heated from a temperature of 22 degrees C to a temperature of 95 degrees C at constant pressure. How much work in joules is done by the gas?
Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s) + H2O(l) --> Ca(OH)2(s). In a beaker, 1.45 g of H2O is added to 1.50g of CaO.
The flask and its contents weigh 470.9 g. (b) How much does the flask weigh when filled with chloroform (d = 1.48 g/cm3)?
Give the molecular formula of a hydrocarbon containing five carbon atom containing five carbon atoms that is (a.) an alkane, (b.) a cycloalkane, (c.) an alkene, (d.) an alkyne.
While in Europe, if you drive 113Km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 39.0mi/gal?
C6H6 burns in air to produce CO2 and H20. Calculate the heat release in KJ/g of the compound reacted w/ oxygen. The standard enthalpy of formation of C6H6 is 49.04 KJ/mol.
During the dehydration reaction when acetaldehyde was reacted with KOH in ether, an intermediate was formed. What was this intermediate that was eventually converted to the final product?
The inhaled air contains 0.50% H2O and 20.9% O2 by volume; the exhaled air contains 6.2% H2O and 15.3% O2 by volume. How many moles of H2O are expelled from the body each minute?
The pressure increases from 1.10 atm to 3.06 atm, and the volume of the sample changes from 2.67 L to 4.57 L. To what temperature, in oC, was the methane heated?
The reaction of magnesium metal with HCl yields hydrogen gas and magnesium chloride. What is the volume, in liters, of the gas formed at 736 torr and 18 oC from 4.49 g of Mg in excess HCl?
The pressure on a balloon holding 411 mL of an ideal gas is increased from 211 torr to 1.00 atm. What is the new volume of the balloon (in mL) at constant temperature?
If a molecule of NO diffuses a distance of 0.778 m from a point source, calculate the distance (m) that a molecule of He would diffuse under the same conditions for the same period of time.
A gas at a temperature of 382 K, a pressure of 197 kPa and occupying a fixed volume of 0.38 m3, is heated so that the temperature of the gas rises by 34 K. What is the pressure of the heated gas? Gi
Draw a lewis structure for AlF6 3- ion. include lone pair electrons. you do not need to include formal charges in your structure.
The mass of ethanol needed to fill the tube is found to be 11.40 . The density of ethanol is 0.789. Calculate the inner diameter of the tube in centimeters.
The resulting organic solution is extracted with 10ml of water. The Kp for 9-fluorenone in diethyle ether/water is 9.5, how much would remian in the ether layer?
At equilibrium, the vessel contains 4.8 x 10^-3 mol NOCl, 1.6 x 10^-3 mol NO and 3.5 x 10^-3 mol Cl2. What are the partial pressures of the three gases at equilibrium?
A sphere of copper is subjected to 81.1 MPa of pressure. The copper has a bulk modulus of 130 GPa. By what fraction does the volume of the sphere change?
A 0.4512 g sample of a primary-standard-grade Na2CO3 required 36.44 ml of a H2SO4 solution to reach the end point of the reaction. CO32- + 2H+ → H2O + CO2 What is the molarity of H2SO4?
For the equilibrium Br2 (g) Cl2 (g) <===> 2BrCl (g) at 400 K, Kc = 7.0. 0.28 mol of Br2 and 0.28 mol of Cl2 are introduced into a 1.0-L container at 400 K. What will be the equilibrium conce
Given the reaction X(aq) 3Y(aq) <===> 2Z(aq). Suppose the initial [X] is 0.55M and [Y] is 0.80 M. After equilibrium is reached, [X] = 0.35M. Calculate the Keq (Kc) for this reaction.
When .8436 mole of naphthalene(C10H8), a solid, is burned in a constant- volume bomb calorimeter at 298K, 5150 kJ of heat is evolved. Calculate delta H for the raction on a molar basis.
A certain first-order reaction has a rate constant of 2.75 x 10^-2 s^-1 at 20 degrees C. What is the value for k, the reaction constant, at 60 degrees if the Energy of activation = 75.5 kJ/mol?