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A laboratory animal exercised on a treadmill that was connected to a weight with a mass of 256 g through a pulley. The work done by the animal raised the weight through 1.22 m.
A student makes 215 mL of a 3.15M solution of Na2SO4. he then forgets to seal it and some water evaporates overnight. When he comes back int he morning, the volume of the solution is only 205 mL.
Starting with 3.10 moles of HBr in a 12.0 L reaction vessel, calculate the concentrations of H2, Br2, and HBr at equilibrium.
The acidic constituent in vinegar is acetic acid. A 10.0-mL sample of a certain vinegar contains 500. mg of acetic acid. What is this mass of acetic acid expressed in micrograms?
What is the molality of a solution that contains 3.0g urea (molecular weight = 60 amu) in 100g of benzene?
Would you be able to use Fe(3+)ions as an indicator for determining the concentration of silver in an unknown solution?
What was the chemical reaction in the body, and what substance in the liver was produced to help catalyze the reaction?
Carbonyl stretching frequency of aliphatic carboxylic acids in dilute solution is located near 1770/cm. This frequency is much higher than the carbonyl frequency of these substances when measured n
A .150 gram sample of solid lead(II) nitrate is added to 125 mL of .100 M sodium ... .100 M sodium iodide solution. Calculate the number of moles of each reactant? ....
What is the lewis dot structure for KNO3?
How many moles of HCl are required to react with 0.610 g of Al(OH)3 in the above unbalanced reaction? Use at least as many significant figures in your molar masses as in the data given.
A gaseous mixture of O2 and N2 contains 30.8 nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 805 mmHg ?
Silver has two naturally occurring isotopes. Find the percent abundances of 107Ag and 109Ag given the atomic mass of Silver = 107.868 amu.
Show example of a standardization of a base NaOH USING PRIMARY STANDARD KHP show an example
The solubility of O2(g) in water is 4.43 mg O2/100 g H20 at 20 degree Celsius when the gas pressure is maintained at 1 atm. What is the molarity of the saturated solution?
A certain "promenade" calls for the formation of groups, with each group consisting of one man with two women. a)How many groups could be formed? b) which sex is in excess? By how much?
Calculate the volume of 3M aqueous sodium hydroxide needed to neutralize the acetic and phosphoric acids in the synthesis of acetylferrocene?
Could 131 g of Xe gas in a vessel of 1.00 dm^3 exert a pressure of 20.0 atm at 25 C if it behaved as a perfect gas? If not, what pressure (in atm) would it exert?
A 255- flask contains pure helium at a pressure of 753 . A second flask with a volume of 465 contains pure argon at a pressure of 716 .If the two flasks are connected through a stopcock and the sto
Calculate the amount of heat transfered when 24.0 g of CH3OH decompose at constant pressure. delta H is 126.4 kJ
I1 = 589.5 kJ/mol, I2 =1145 kJ/mol, I3= 4900 kJ/mol, I4 = 6500 kJ/mol, and I5 = 8100 kJ/mol. Which one of these five elements is most consistent with this pattern of ionization energies?
Find the corrected flask volume using the following: volume of water needed to fill flask=996mL capillary tubing radius=1.5mm length of tubing below the stopper=30cm.
In general, most substances melt at a higher temperature as pressure is increased (except water). Justify this behavior from your knowledge of the variation of chemical potential with pressure and
Determine the number of representative particles in each substance:
NiCl2 solution calculate the concentration, in moles per liter , of each of the ions present after mixing . assume that the volumes are additive.