question 1
(Unifesp) Oxygen therapy, therapeutic treatment with oxygen gas, is indicated for patients who have a lack of oxygen in the blood, such as patients with pulmonary diseases. The oxygen gas used in this treatment can be sold in cylinders at high pressure, under the conditions shown in the figure.
On the cylinder, it is indicated that the content corresponds to a volume of 3 m3 of oxygen at the ambient conditions of pressure and temperature, which can be considered to be 1 atm and 300 K, respectively.
Given R = 0.082 atm. LK-1.mol-1, the mass of oxygen, in kg, stored in the gas cylinder shown in the figure is approximately:
DATA: Oxygen molar mass = 16 g/mothere
a) 0.98.
b) 1.56.
c) 1.95.
d) 2.92.
e) 3.90.
question 2
A mobile performs a uniform movement with a speed equal to 72 km/h. If this rover starts from the 5 m position of a numbered line, how soon will it reach the 55 m position?
a) 3.0 s
b) 3.5 s
c) 2.0 s
d) 2.5 s
e) 1.5 s
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