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a helium-filled weather balloon is launched from the ground where the pressure is 752 mmHg and the temperature is 21 degrees celsius. under these conditions its volume is 75.0 L. when it has climbed to an altitude where the pressure is 89 mmHg and the temperature is 0 degrees celsius, what is the volume?
Determine the empirical and molecular formulas of Ibuprofen has 75.69% C, 8.80%H and 15.51%O by mass and has a molar mass about 206g/mol.
when 56.6 g of calcium and 30.5 g of nitrogen gas undergo a reaction that has a 93.0% yield, what mass (g) of calcium nitride forms.
Determine the value of the solubility-product constant if solubility of T3U2 =4.24× 10-20 mol/L.?
What velocity would an electron 9.11*10^-31 kg need for its de Broglie wavelength to be that of red light 745nm ?
Combustion Analysis of Toluene, Combustion analysis of toluene, a compound containing carbon and hydrogen only, gives 5.86 mg carbon dioxide and 1.37 mg of water. What is its empirical formula?
Determine the percent yield for the reaction between 3.74g of Na and excess O2 if 5.35g of Na2O2 is recovered
A graduated cylinder contains 129 mL of water. A 17.0 g piece of iron (density = 7.86 rm{g/cm^3}) and a 17.0 g piece of lead are added. What is the new water level in the cylinder?
A 4.70 g nugget of pure gold absorbed 278 J of heat. The initial temperature was 28.0°C. What was the final temperature.
A 135 mL sample of a 15.0 M ethylene glycol (rm C_2H_6O_2) solution is diluted to 1.50 L.What is the freezing point of the final solution.
What is the percent yield of a reaction in which 111.6 g phosphorus trichloride reacts with excess water to form 60.8 g HCl and aqueous phosphorous acid (H3PO3)?
If a total of 13.5 mol of NaHCO and 4.5 mol of C H O react, how many moles of CO and Na C H O will be produced? 3NaHCO (aq) + C H O (aq) 3CO (g) + 3H O(s) +Na C H O (aq).
Determine how many moles of gas were added to the container If the pressure raised to 800. torr,?
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