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Calculate the number of grams of isopropyl alcohol (rubbing alcohol), C3H8O, which must be added to 275 g of water to prepare a 2.00 m solution of isopropyl alcohol.
A sample of nitrogen gas is collected over water at a temperature of 20 degrees celcius and a pressure of 1.00 atm. the volume of the collected gas is 250.0 L. what is the mass of N2 collected? (at
If 83.7 grams of aluminum, Al, and 195.2 grams of sulfur, S, are put into a container and allowed to react according to the above equation, which substance(s) and how many grams of each would be prese
Write an expression for the reaction rate law.
What percentage of the water will be vapor when the system reaches equilibrium?assume ideal behavior of water vapor and that the volume of liquid water is negligible. the vapor pressure of water at
Platinum crystallizes with a face-centered cubic unit cell. The radius of a platinum atom is 139 pm. Calculate the density of platinum.
Charles flew the balloon for fifteen miles and stayed in the air for a total flight time of 45 mins. the balloon was made of silk coated with a thin layer of natural rubber and had a diameter of 27ft.
Write the equation for the heat of formation of C2H6(g). Calculate the change in enthalpy if 25.0 g of acetylene reacts with 15.0 g of hydrogen
The pressure exerted on a 240 ml sample of hydrogen gas at constant temperature is increased from .428 atm to .724 atm. What will the final volume of the sample be?
Determine the final value of n in a hydrogen atom transmition, if the electron starts in n=2 and the atom absorbs a photon of light with a frequency of 4.75x10^14 Hz
A helium-filled balloon has a volume of 2.75 L at 17 C. The volume of the balloon decreases to 2.36 L after it is placed outside on a cold day. What is the outside temperature in K?
Acetylacetone (acac) forms a trisacetylacetonateiron (III) complex (i.e., Fe(acac)3) in aqueous solution. A 5 mL aliquot of acetylacetone stock solution is diluted to 200mL with an iron (III) chloride
oxygen gas is collected over water at 21 degrees C and an atmosperic pressure of 748 mm Hg. What is the partial pressure of oxygen gas in the mixture.
8.5 g of steam at 373 K is added to 305 g of H20 (l) at 310 K at constant pressure of 1 bar. Is the final state of the system steam or liquid water? Calculate delta S for the process.
In an experiment you combine 4-methyl-2-pentene and water, in the lab you setup the experiment using a a heater, condenser and N2 gas and add the reagent H2SO4, the product formed is 2-methyl-2-pentan
Magnesium hydroxide is 54.87% oxygen by mass. How many grams of oxygen are in 175 g of the compound? How many moles of oxygen is this?
How much heat is required to warm 219 g of ice from -45.7°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C
You have two water samples. Sample X has a volume of 750 mL and a temperature of 42°C. Sample Y has a volume of 380 mL and a temperature of 42°C. Which sample contains the most heat?
A student placed 17.0 g of glucose in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100. mL mark on the neck of the flask
When thermal equilibrium has been reached, the water and the iron are both at 36.2°C. Calculate the specific heat of the iron. Assume no heat loss to the calorimeter and the density of water is 1.00
A solution is prepared by adding 8.28 grams of an unkown compound to 217 g of cyclohexane (C6H12). This solution freezes at 3.0 degree C. Calculate the molar mass of the compound.
A gas is compressed from an initial volume of 5.60 L to a final volume of 1.23 L by an external pressure of 1.00 at room atm. During the compression the gas releases 125 J of heat.
Suppose 1.5 mol of methane is allowed to react with 4 mol of oxygen. (a) what is the limiting reagent and (b) How many mole of CO2 can be made from this mixture? How many milligrams of CO2?
An unknown salt is either NaCn, NaC2H3O2, NaF, NaCl, or NaOCl. When .100 mol of the salt is dissolved in 1.0 L of solutionk, the pH of the solution is 8.07. What is the identity of the salt?
How many grams of water can be cooled from 45 to 18 by the evaporation of 62 of water? (The heat of vaporization of water in this temperature range is 2.4 . The specific heat of water is 4.18 .)