Question

24) Which of the following represent STP (Standard Temperature and Pressure) conditions? A) T -0 K and P = 1 atm B) T=0°C and P 760 atm C) T= 273 K and P = 0 atm D) T-273 K and P-1 atm E) T = 1 K and P = 1 atm 25) Which of the following is TRUE for a liquid that is placed in a sealed container? A) Condensation of the evaporated molecules in the jar can only occur once all of the liquid molecules are in the vapor (or gaseous) state. B) A set vapor pressure will be reached, which is the same at all temperatures. C) Evaporation of the liquid cannot occur. D) All molecules stay in the liquid state. E) Once equilibrium is established between the liquid and the vapor, the rate of the evaporation process will equal the rate of condensation. 26) Which of the following statements correctly describes Boyle's Law? A) The pressure of a gas is directly proportional to the Kelvin temperature of the gas, if the volume and amount of gas remain constant. B) The total pressure exerted by a mixture of gases in a container is the sum of the partial pressures that each gas would exert alone. C) The volume of a gas is directly proportional to the number of moles of the gas, if the pressure and temperature remain constant. D) The volume of a gas is directly proportional to the Kelvin temperature of the gas, if the pressure and amount of gas remain constant. E) The pressure of a gas is inversely proportional to the volume of the gas, if the temperature and amount of gas remain constant. 27) 27) What mass of helium is contained in a 2.0 L balloon at 30.0°C and 735 mm Hg? A) 26.5 8 B) 66.1 g C) 0.312 g D) 514 g E) 0.477 g 28) 28) What quantity is directly proportional to the kinetic energy of the particles in a gas? A) absolute temperature B) distance between molecules C) formula mass D) volume of the individual particles F) atomie mass 29) 29) A sample of oxygen pas occupies 3.0 L at a pressure of 1.5 atm. If the volume of this Sample increases without changing the temperature or the amount of gas, what can be said about the pressure? A) The pressure of oxygen will be greater than 1.5 atm B) The pressure of oxygen will remain at 1.5 atm C) The pressure of oxygen will be less than 1.5 atm D) The pressure of oxygen will be 4.5 atm E) It is impossible to predict

Answer 1

2) As per conditions decided by I UPAC, value of standard temperature and pressure are decided universally as T=273k and Palam