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At 25 degree C, the vapor pressure of pure water is 23.76 mmHg and that of seawater is 22.9 mmHg. Assuming that seawater contains only NaCl, estimate the molal concentration.
After the system reached equilibrium, the total pressure was found to be 7.43 x 10^-2 atm. Calculate the value of kp for this reaction.
The tank contains 4.98 mol of methane (CH4) and 0.66 mol of ethane (C2H6). What is the partial pressure (in kPa) of each of the component gases in the tank? Show ALL work (Formal Method).
How many moles of KBr are present in 150 mL of a 0.275 M solution? (c) How many milliliters of 6.1 M HCl solution are needed to obtain 0.100 mol of HCl?
If you dilute 10.0 mL of the stock solution to a final volume of 0.250 L, what will be the concentration of the diluted solution?
A sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution has a density of 1.329 g>cm3. Calculate (a) the mass percentage, (b) the mole fraction, (c) the molality, (d) the mol
A 77 kg rock with a volume of 4 L is completely submerged in water. The density of water is 1 kg/L. What volume of water is displaced by the rock?
A 40607 lb force is applied to a surface that measures 79 in long and 8 in wide. Determine the pressure exerted on the surface by the force in both psi and Pa. 1 Pa = 1.45×10-4 psi.
A 1.5-kg copper block is given an initial speed of 4.0 m/s on a rough horizontal surface. If the block absorbs 85% of its initial kinetic energy as internal energy, calculate its increase in temperat
The surface water is at a temperature of 25°C, while the bottom of the pond is at 12°C. Find the rate at which energy is transferred by conduction from the surface to the bottom of the pon
An isolated quantity of an ideal gas at 296.1 K has a volume of 16.09 L at a pressure of 1.51 atm. What is the pressure of this gas sample when the volume is halved and the absolute temperature is mul
If we assume the earth's orbit around the sun to be circular, with a radius of 93 million mi, how many miles does the earth travel (around the sun) in 125 days?
A piece of nichrome wire is embedded into a 1-kg block of ice at -10 C. a current of 3.0 A and a voltage of 12 volts is maintained in the wire. How long will it take to separate the wire from the ic
The percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (atomic weight = 78.4). Then minimum molecular weight of peroxidase anhydrous enzyme is (a) 1.568 × 104 (b) 1.568 ×
Residents of a town of maplegrove who are connected to the municipal water supply are billed a fixed amount plus a monthly chare for each cubic foot of water used. A household usin 1000 cubic feet
List a balanced chemical equation for each of these chemical reaction types and explain how it is used in your example above.
Write the balanced formula unit equation for the reaction stated above.
Water at 33.0 °C is sprayed onto 0.156 kg of molten gold at 1063 °C (its melting point). The water boils away, forming steam at 100.0 °C and leaving solid gold at 1063 °C. What is th
The polar ice caps contain about 2.3 * 10^19 kg of ice. This mass contributes essentially nothing to the Earth's moment of inertia because it's located near the poles. Estimate the change in the len
Gas is confined in a tank at a pressure of9.8atm and a temperature of26.5°C. If two-thirds of the gas is withdrawn and the temperature is raised to68.0°C, what is the pressure of the gas rem
A rigid tank contains 1.30 moles of an ideal gas. Determine the number of moles of gas that must be withdrawn from the tank to lower the pressure of the gas from 28.2 atm to 4.60 atm. Assume the vol
A 10.0 ml diluted chloride sample required 44.89 ml of 0.01982 M AgNO3 to reach the Fajans end point. how many moles of Cl- ions were present in the sample? What was the concentration of chloride in
Question: A student measures 5.45 cm3 of chloroform using a glass syringe. Given that the density of chloroform is 1.48 g/mL, and the molar mass is 119.38 g/mol, how many moles of chloroform did the
A brick is initially 12.67 cm high and an aluminum can is initially 12.68 cm high. By how much must their temperatures be raised in order for the brick and the can to have exactly the same height
Copper (II) sulfate dissolves in water to form a blue solution. What species are present in the solution, ie, what is actually swimming around in the solution? Write the formulas.