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how many moles of co(nh2)2 are present in 150 g of water, if the freezing point of the solution is -4.02 degrees c?
a student heated a .546 gram pure chemical in an atmosphere of oxygen gas until it had completely reacted the final chrominum compound weighed .798 grams what is the empirical formula of this compound?
Silver consists of two major isotopes with the following percent abundances and atomic masses: 107Ag (51.84% and 106.90509 amu) and 109Ag (48.16% and 108.90476 amu). Calculate the average atomic mass of silver to five significant digits.
what is the theoretical yield of carbon dioxide when 56.0 g of methane is burned in a excess of oxygen, according to the equation CH4 2 )2 ->CO2 ,2H2o.
Write a formula for the conjugate base formed when each of the following behaves as a bronzed acid.
Consider 1.00 L of air in a patient's lungs at 37.0 C and 1.00 atm pressure. What volume would this air occupy if it were at 25.0°C under a pressure of 5.00* 10-2 atm (a typical pressure in a compressed air cylinder)?
calculate the molar concentration of OH- ions in an 0.85M solution of hypobromite ion, BrO- (Kb = 4.0x10^-6). what is the pH of this solution?
What mass of the hydrate could be recovered from the solution? When separated from a H 2 O solution, copper sulphate forms a hydrate with 5
An unknown metal X with a mass of 28 grams absorbs 58 J of heat. calculate the heat capacity if Its temperature raises from 31.1 °C to 39.9 °C.
At 0.0oC, if the volume of air is 3.4 mL and the pressure of the atmosphere that day is 695 mmHg, what is the number of moles of air?
What is the significance of high pressure used in HPLC?
A zero-order reaction has a constant rate of 3.50×10-4 M/rm s. If after 65.0 seconds the concentration has dropped to 1.00×10-2 M, what was the initial concentration?
what is the molar mas of gas if 1.20g of the gas has a volume of 235 mL at STP? A 1.26 sample of He gas has a pressure of .123 atm and volume of 32.6 L. what is the temperature in degrees C?
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