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0.351 g sample of a nonvolatile, yellow crystalline solid dissolves in 15.8 g of benzene, producing a solution that freezes at 4.77 oC. Find the molar mass of the yellow solid. The following may be
When a 6.00-g sample of KCN is dissolved in water in a calorimeter that has a total heat capacity of 2.156 kJ·K-1, the temperature decreases by 0.500 K. Calculate the molar heat of solution
A block of wood is either oak or pine. Its dry weight is 19.8 lbs and it will displace a volume of 2.7 gallons of water. Is the wood oak or pine? The density of oak is 0.9 g/cm3 and the density of p
When 24.4 mL of 0.500M H2SO4 is added to 24.4ml of 1.00M KOH in a coffee cup calorimeter at 23.5 degrees Celcius, the temperature rises to 30.17 degrees celcius. Calculate delta H of this reaction
How much PV work is done (in kilojoules), if 88.0 g of ethylene and 120 g of HCl are allowed to react at atmospheric pressure and the volume change is -70.3 L?
1.64g of a mixture of CaCO3 and MgCO3 was dissolved in 50ml of 0.8 M HCL. the excess of acid required 16ml of 0.25M NaOH for neutralization. Calculate the percentage of CaCO3 and MgCO3 .
A sample of ethane vapor is added to the same flask until the total pressure is 1.45 atm. What is the partial pressure of argon in the flask?
A sample of a compound containing only chlorine and oxygen reacts with an excess of hydrogen gas to give 0.278 g HCl and 0.206 g water.
A solution contains Cr3+ ion and Mg2+ ion. The total mass of the precipitate is 49.6. Find the mass of Cr3+ in the original solution.
The dipole moment (mu) of HBr (a polar covalent molecule) is 0.790 D (debye), and its percent ionic character is 11.7%. Estimate the bond length of the {H-Br} bond in picometers.
calculate the concentration of solution if 45% aqueous calcium chloride whose density is 1.10 g/ml. formula weight of calcium chloride= 110 g.mole
It is desired to inflate a baggie with a volume of 842 milliliters by filling it with oxygen gas at a pressure of 1.21 atm and a temperature of 306 K. How many grams of O2 gas are needed?
A 30.1-g sample of Ne gas exerts a certain pressure in a container of fixed volume. What mass of Ar is required to exert half the pressure at the same conditions of volume and temperature?
75.0 mL of a 1.40 M solution is diluted to a total volume of 278 mL. A 139-mL portion of that solution is diluted by adding 117 mL of water. What is the final concentration? Assume the volumes are a
The excess acid then requires 30.10 mL of 0.1220 M NaOH for complete neutralization. Calculate the % Na2CO3 (MM = 105.99 g/mol) in the sample.
The mixture was then heated and held at boiling for 45 minutes. 0.2533 g of the precipitate, barium sulfate, was filtered off, washed and dried. Determine the identity of the halogen, X.
The pressure exerted by a gas is 2.0 atm while it has a volume of 350 cm3. What would be the volume of this sample of gas at standard atmospheric pressure?
A sample of a diatomic gas occupies a volume of 2.35 L at a pressure of 0.979 atm and a temp of 26.4 C. Calculate the molecular weight and determine the identity of the gas if the gas sample weighs
A sample of gas under a pressure of 622 kPa has a volume of 233 cm3. The pressure is increased to 988 kPa, while the temperature remains constant. What volume will the gas occupy at this pressure?
A 100 mL sample of a 6.0 mol/L solution of H2SO4 is diluted to a final volume of 500 mL. What is the concentration of the diluted solution?
What is the pH of 1.00L of the buffer solution that contains 0.100 M HF and 0.120 M NaF after 0.020 of HNO3 is added? The Ka of HF is 3.5 x 10-4, and so pKa = 3.46.
What is the chemical formula for the possible precipitate? Look in your textbook for any necessary equilibrium constants.
Derive an equation for the temperature dependenc of the vapor pressure of a liquid (analogous to the integrated form of the Clausius-Clapeyron equation).
Using the symbols alpha and beta for the two spin states, show how 4 equivalent hydrogen atoms can couple to a CH2 group leading to a quintet with peak ratios of 1:4:6:4:1.
A 27.0-g sample of water at 290. K is mixed with 49.0 g water at 320. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.