The box in the above picture is falling from the top of a building to the ground. Two major forces are acting on the box as it f
alls. Which force is represented by the arrow labeled Q?
A.
the force of magnetism
B.
the force of gravity
C.
the net force of the object
D.
the force of air resistance
A.
the force of magnetism
B.
the force of gravity
C.
the net force of the object
D.
the force of air resistance
2 answers:
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Answer:
1.635 M
Explanation:
Given:
10 mL of 20 volumes Hydrogen Peroxide
Here,
20 volumes of Hydrogen Peroxide means that on decomposition of 1 mL of H₂O₂ 20 mL of O₂ is obtained
also,
means 1 dm³ of H₂O₂ solution produces 20 dm³ oxygen
Now,
at 298K and 1 atm
20 dm³ oxygen = moles
or
= 0.817 moles
also,
2H₂O₂ → 2H₂O + O₂
thus,
1 dm³ of solution must contain 2 × moles of O₂ as moles of H₂O₂
thus,
Number of moles of H₂O₂ = 2 × 0.817
or
Number of moles of H₂O₂ = 1.635 moles
Hence,
For 20 volume hydrogen peroxide is 1.635 M