How many moles of a gas sample occupying 0.750 L at o.316 atm and 25 degree C? W

Question

How many moles of a gas sample occupying 0.750 L at o.316 atm and 25 degree C? Which of the following relates the volume of gas to the number of molecules of gas? a. Boyle's law. b. Charles's law c. Dalton's law d. Avogadro's hypothesis. An ideal gas at 300 K and 760 mm Hg is contained in a flexible vessel. Its volume is halved and the pressure remains unchanged. The temperature is a. 75 K b. 150 K c. 300 K d. 600 K e. 1200 K What is the number of molecules in 10.0 L of air at 20 degree and 2 atm? What is the quantity of heat evolved when 100 g of water is formed from the combustion of hydrogen and O_2? H2 + 1/2O_2 rightarrow H_2O Delta H= -285.8 kJ/mol

Explanation / Answer

Q16.

Apply ideal gas law

PV = nRT

n = moles, V volume in L, P, pressure in atm, T, absolute T, 25°C = 298K, R ideal gas constant 0.082 Latm/molK

si

n = PV/(RT)

n = (0.316)(0.75)/(0.082*298)

n = 0.0096988 mol of gas

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