Recent Homework Questions About Chemistry
SHOW WORK A 44g sample of CO2 has a volume of 22.4 L at STP. The sample is heated to 71 degrees Celsius and compressed to a volume of 18.0 L. What is the resulting pressure?
Wednesday, December 4, 2013 at 4:03pm
SHOW WORK A cylinder contains 98g of air at 295K. The pressure in the cylinder is 174psi. If 32g of air are allowed to escape and the cylinder is heated to 335K, what is the new pressure?
Wednesday, December 4, 2013 at 4:01pm
SHOW WORK A cylinder contains 36.5g of argon gas at a pressure of 8.20atm. The valve is opened and gas is allowed to escape until the pressure is reduced to 4.75atm at constant temperature. How many grams of argon escaped?
Wednesday, December 4, 2013 at 3:59pm
SHOW WORK A cylinder contains 22g of air. If 77g of air are pumped into the cylinder at constant temperature, how does the pressure in the cylinder change?
Wednesday, December 4, 2013 at 3:56pm
SHOW WORK A cylinder containing 48g of nitrogen gas at room temperature is placed on a scale. The valve is opened and 12g of gas are allowed to escape. Assuming that the temperature of the cylinder remains constant, how does the pressure change?
Wednesday, December 4, 2013 at 3:54pm
SHOW WORK How many moles of helium occupy 26.4 L at a pressure of 103.0 kPa, and 10 degrees Celsius? A.) 0.03 mole B.) 0.86 mole C.) 1.16 mole D.) 32.72 mole
Wednesday, December 4, 2013 at 3:51pm
magnesium carbonate is MgCO3 So, each molecule will produce a molecule of CO2 27% of 670kg is 180.9kg each mole of MgCO3 has a mass of 84.3g, so we have 2145.9 moles of MgCO3. That will produce 2145.9 moles of CO2, each with a mass of 44g.
Wednesday, December 4, 2013 at 6:33am
when 2.750 g of the oxide of lead is heated to a high temperature,it decomposes to produce 0.0640 g of oxygen gas and 2.686 g of some new lead oxide compound.How can you use this data to determine the formula of the new compound?
Wednesday, December 4, 2013 at 6:23am
in order to find molarity you have to Divide the number of moles of solute by the number of liters of solution. so for this specific problem convert the grams of NaCl to moles and the ml of solution to Liters then divide.
Wednesday, December 4, 2013 at 4:25am
If you have 10.00 mL of 0.5875 M H3PO4, how many mL of 0.2625 M NaOH are needed to reach the point of complete neutralization?
Wednesday, December 4, 2013 at 1:50am
I hae read this question over and over and I don't understand it at all. There is a question for (i) and that can be answered rather easily but there is no question for (ii). There is only a statement.
Tuesday, December 3, 2013 at 11:46pm
See your post below.
Tuesday, December 3, 2013 at 10:03pm
This is a limiting reagent (LR) problem. You know that because amounts are given for BOTH reactants. mols Ag = grams/atomic mass = ? mols HNO3 = grams/molar mas = ? Using the coefficients in the balanced equation, convert mols Ag to mols NO formed. Do the same for mols HNO3 to...
Tuesday, December 3, 2013 at 5:19pm
You don't have a question. I assume you want to determine the change in T of the air. heat lost by ethanol + heat gained by air = 0 [mass ethanol x specific heat ethanol x (Tfinal-Tinitial)] + [mass air x specific heat air x (Tfinal-Tinitial)] = 0 Substitute the values ...
Tuesday, December 3, 2013 at 4:44pm
n and inQ are doubled EAo and E have no change Q is squared
Wednesday, May 8, 2013 at 1:43pm
Gas solubility increases: 1) Air in blood: a diver descends 10M, ad pressure increases by 1 atm. 2) The pressure of a gas over a solvent is increased. 3)The particle pressure of an anesthetic gas is increased. Gas solubility decreases: 1) O2: The temperature of a body of water...
Wednesday, January 23, 2013 at 8:29pm
I need help too!
Monday, January 11, 2010 at 9:02pm