Answer:
4L
Explanation:
To obtain the volume of O2 at stp, first, we need to determine the number of mole of O2.
From the question given above,
Mass of O2 = 5.72g
Molar Mass of O2 = 32g/mol
Number of mole =Mass/Molar Mass
Number of mole of O2 = 5.72/32
Number of mole of O2 = 0.179 mole
Now, we can calculate the volume of O2 at stp as follow:
1 mole of a gas occupy 22.4L at stp.
Therefore, 0.179 mole of O2 will occupy = 0.179 x 22.4 = 4L
Therefore, the volume occupied by the sample of O2 is 4L
Answer:a) ∆E=-0.077KJ (exothermic)
b) ∆E = 110KJ (endothermic)
Explanation:
a) ∆E = q + w
q= 0.763 KJ
w= -840J = -0.840 KJ
∆E = 0.763-0.840 = - 0.077KJ
Exothermic reaction are those reactions that proceeds with the release of heat to the surroundings and Energy is negative in exothermic processes.
b)/∆E = q+w
q= 66.1KJ, w=44KJ
∆E = 101KJ
And it is endothermic
When work is done on a system, the international energy increases.
Oxygen is the most abundant by weight
(2) U-238 is the radioisotope used in dating geological formations. Uranium-238 has a half-life of 4.46 billion years, which makes it suitable to date such old formations.
The other options do not have such long durabilities and half-lives.
Answer:
D
Explanation:
Diffusion is directly propotional to temperature i.e. if the temperature is hight diffusion is more and vice versa
Moreover, diffusion is inversely propotional to size i.e. if molecules are large , diffusion is less and vice versa