question 1
(UFF) Until the mid-seventeenth century, the concept of a vacuum, as a region devoid of matter, was unacceptable. However, experiments related to the measurement of atmospheric pressure allowed a new conception, considering the vacuum as a region where the pressure is much lower than that of its surroundings. Currently, it is possible to obtain a vacuum, in laboratories, with the technological resource of vacuum pumps. Assume that a vacuum at a pressure of approximately 1.00 × 10 has been obtained-10 atm at a temperature of 300K. Using the perfect gas model, determine the number of molecules per cm3 existing in that vacuum.
Data:
Avogadro's number = 6.02×1023 molecules/mole
Universal gas constant = 8.31 J/mol K
1 atm = 1.01 × 105 N/m2
question 2
(UFSM) The variables that can define the possible states for 1 mole of ideal gas are:
a) heat, mass and volume.
b) temperature, density and pressure.
c) temperature, pressure and volume.
d) density, pressure and heat.
e) density, mass and heat.
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