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1. A 125mL Erlenmeyer flask has a measured volume of 148 mL. A 0.477 g sample of an unknown vapor occupies the flask at 94.8°C and a pressure of 736 mmHg. Assume ideal gas behavior:
a. How many moles of vapor are present?
B.What is the molar mass of vapor?
The enthalpy change for melting ice at 0°C and constant atmospheric pressure is 6.01 kJ/mol. Calculate the quantity of energy required to melt a moderately large iceberg with a mass of 1.39 million metric tons. (A metric ton is 1000 kg.)
It takes 55.0 J to raise the temperature of an 8.80 g piece of unknown metal from 13.0C to 25.0C. What is the specific heat for the metal? Express your answer numerically, in J/g. C
Baking soda decomposes into sodium carbonate, water vapor and carbon dioxide. how many liters of gas will be produced at 155 C and 753 torr by the complete decomposition of 3.2 g of sodium bicarbonate?
Which of the following chlorides is the most ionic? Please explain a) CH2Cl2 b) SiCl4 c) SCl2 d) PbCl2 Please expalin
Vitamin C, Molar mass 176.12 g/mol, is a compound of C, H, and O, and found in many natural sources, especially citrus fruits. When 1.000 g sample of vitamin C is burned in a combustion apparatus, the following data are obtained
A 345 mL container holds NH3 at a pressure of 745 torr and a temperature of 45 degrees Celsius. What is the molar concentration of ammonia in the container?
substance A has a smaller heat of vaporization than substance B. Which will undergo a larger change in vapor pressure for a given temperature
Question- A polymer graft is incubated in a large container of plasma solution containing albumin (40 mg/ml), fibrinogen (2 mg/ml) and globulin (4.6 mg/ml). The diffusion coefficients of these protein molecules
A sample of unknown gas at STP has a density of 0.630 g per liter. What is the gram molecular mass of this gas?
While making a methyl butanoate ester, and after we were done heating it up, we filtered it with water and NaHCO3. What gas escaped during the sodium bicarbonate washing?
a chloroform solution of caffeine c8h10n4o2 contains concentration of 0.0868 m . compute mole fraction of
assuming the temperature is constant predict whether the change in entropy delta s is positive negative or zero during
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