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63.0 mL of a 1.20 M solution is diluted to a total volume of 218 mL. A 109-mL portion of that solution is diluted by adding 139 mL of water. What is the final concentration?
A 50.0-L stainless steel container was charged with 3.00 atm of hydrogen gas and 4.00 atm of oxygen gas. A spark ignited the mixture, producing water.
What weight of A would be removed by four successive extractions with 25-mL portions of ligroin? how much ligroin would be required to remove 98.5% of A in a single extraction?
An aqueous solution contains o.180g of an unknown, nonionic solute in 50.0g of water. The solution freezes at -0.1079 degrees Celsius. What is the molar mass of the solute?
What were the weights of the two 25.00 mL samples? Do these data support the manufacturer's specification that the pipet delivers 25.00 ± 0.03 mL?
Determine how many moles of Ba(OH) 2 are required to completely neutralize 0.110 mole of HC 2 H 3 O 2 ?
The coast gurard wishes to send a speedboat to intercept and investigate the vessel. b) find the time required for the cutter to intercept the ship.
An aqueous potassium nitrate solution has a freezing point of -2.0 .C. How many moles of potassium nitrate are contained in 0.5 kg of water in this solution? The freezing point depression constant f
2 NO(g) + O2(g) 2 NO2(g) In one experiment 0.633 mole of NO is mixed with 0.354 mole of O2. Calculate also the number of moles of NO2 produced.
Concentrated NaOH is 12 M and has a density of 1.53 g/mL. What is the percent NaOH by mass of concentrated NaOH?
What is the molar mass of a nonelectrolyte if 6.02 grams dissolved in 30.0 grams of benzene freezes at -1.55 .C? The freezing point of pure benzene is 5.50 .C and the freezing point depression const
Even though the carbonyl and amine are connected by a single bond, there is essentially no rotation around this bond, why is that? Can the amine group of the peptide bond function as a nucleophile?
What quantity of ethylene glycol, HOCH2CH2OH, must be added to 50 grams of water to raise the boiling point by 1.0 C? Express this answer in grams.
How much energy (in calories) is needed to heat 10cm^3 of fat from room temperature (25 C) to its melting point (35 C)?
What is the boiling point of a mixture composed of 85 g HOCH2CH2OH (ethylene glycol) and 125 g H2O? The boiling point elevation constant for H2O is 0.512 .C/m.
Sea water has a sodium (Na+) concentration of 1.08 x 104 ppm. If the solution is present as dissolved NaCl, what mass of NaCl is in each liter of sea water? Seawater has a density of 1.05 g/mL.
Calculate the mass of propylene glycol that must be added to 0.330 of water to reduce the vapor pressure by 2.88 torr at 40°C.
A mass of 0.750 g calcium chloride is diluted with 975 g H2O. What is the chloride ion concentration (in ppm)?
The vapor pressure of pure water at 50.0 .C is 92.5 mm Hg. Calculate the ideal partial pressure of water at this temperature for a mixture of 45.0 g H2O and 55.0 g CH3OH?
What is the equilibrium concentration of carbon dioxide in water that is in contact with air at 25 .C and 0.982 atm. The mole fraction of CO2 in air is 3.01 . 10-4. The Henry's law constant for carb
What volume of 0.125 M HClO4 solution is needed to neutralize 45.00mL of 8.70×10-2 M NaOH?
A 4.78-{g} sample of aluminum completely reacts with oxygen to form 6.67 {g} of aluminum oxide. Calculate the mass percent composition of aluminum in aluminum oxide .
After equilibrium was established, it was found that 36.0 percent of the NOCl had dissociated. What is the equilibrium partial pressure of N2O4? Calculate Kp and Kc.
If 18.3mL of 0.800 M HCl solution are needed to neutralize 5.00 mL of a household ammonia solution, what is the molar concentration of the ammonia?
The rock in a particular iron ore deposit contains 80% Fe2O3 by mass. How many kilograms of the rock must be processed to obtain 1400kg of iron?