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An unknown compound contains only carbon, hydrogen, and oxygen. Combustion of 4.00 g of this compound produced 5.87 g of carbon dioxide and 2.40 g of water.If 4.00 g of the unknown compound contained 0.133 mol of rm C and 0.267 mol of H, how many moles of oxygen, O, were in the sample?
The system H2 (g) + I2 (g) ?? 2 HI(g) is at equilibrium at a ?xed temperature with a partial pressure of H2 of 0.200 atm, a partial pressure of I2 of 0.200 atm, and a partial pressure of HI of 0.100 atm.
How many grams of the strong acid HClO4 must be combined with water to make 400 ml of a solution with a pH of 1.5.
In the titration of 68.0 mL of 1.0 M methylamine, CH3NH2 (Kb = 4.4 10-4), with 0.49 M HCl, calculate the pH under the following conditions.
5.0 g of H2O at 23.0 oC is added to 100.0 g of H2O at 67.5 oC. What is the temperature of the resulting mixture
Calculate the maximum numbers of moles and grams of iodic acid (HIO3) that can form when 635g of iodine trichloride reacts with 118.5g of water.
An airbag in?ates in less than 50 msec by the reaction of NaN3 to produce Na and nitrogen gas at 25 ?C. NaN3 → Na + N2 The volume of the airbag is about 30 liters, and it is ?lled to a pressure of 1.4 atm.
When a 7.00-g sample of KCN is dissolved in water in a calorimeter that has a total heat capacity of 2.734 kJ·K-1, the temperature decreases by 0.460 K.
Partial pressures of SO2 and N2, 3.00 g of SO2(g) is originally in a 5.00 L vessel at 21 degrees Celsius and is transferred to a 10.0 L vessel at 26 degrees Celsius. 2.35 g N2(g) is originally in a 2.50 L vessel at 20 degrees Celsius and is transf..
A voltaic cell is set up at 25º C with thefollowing half cells: Al3+ (0.0010 M) | Al and Ni2+(0.50 M) | Ni. Write an equation for the reaction that occurs when the cellgenerates an electric current and determinethe cell potential.
The temperature of a 35.2 g sample of iron increases from 23.7 C to 29.5 C. If the specific heat of iron is 0.450 J/g-K, how many joules of heat are absorbed.
If the specific heat of aluminum is 0.214 cal/g C, how much heat would it take to increase the temperature of a 100. gram block of aluminum from 25.0 C to 75.0 C?
The shielding of electrons gives rise to an effective nuclear charge,Zeff , which explains why boron is larger than oxygen. Estimate the approximate Zeff felt by a valence electron of boron and oxygen, respectively
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