Answer:
2.11 %
Explanation:
In acidic medium iron is in Fe ⁺³ oxidation state .
Equivalent weight = 56 / 3
= 18.33 gm
acid used in titration
= 16.37 mL of .0233 M
= 16.37 x .0233 mL of M soln
= .38 mL of M soln
.38 mL of M soln reacts with .3298 gm of ore
1000 mL of M soln = (.3298 / .38) x 1000 gm of iron ore
867.89 gm
This must contain one gm equivalent of iron
or 18.33 gm
867.89 gm of ore contains 18.33 gm of iron
mass % of iron in the given ore
= (18.33 / 867.89) x 100
= 2.11 %
False.
An incorrect statement.
Nonsense.
A meaningless utterance.
Mass doesn't change.
Gravity has no effect on it.
<u>We are given:</u>
Power of the motor(P)= 95 W
Weight of the object (F)= 120 N
time taken (t)= 6.2 s
Distance covered by the object (s) = s m
<u>Solving for the distance covered:</u>
We are given that the power of the motor = 95 W
we know that <em>power = Work done / Time taken</em>
So, <em>Power = Force * displacement / Time taken </em><em> [Work done = Force * displacement]</em>
replacing the variables
95 = (120 * s) / 6.2
s = 95*6.2 / 120
s = 4.9 m
Answer: beta particles
Explanation:
Given mass = 14.0 g
Molar mass = 137 g/mol
According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number of particles.
1 mole of cesium contains atoms =
0.102 moles of cesium contains atoms =
The relation of atoms with time for radioactivbe decay is:
Where =atoms left undecayed
= initial atoms
t = time taken for decay = 3 minutes
= half life = 30.0 years = minutes
The fraction that decays :
Amount of particles that decay is =
Thus beta particles are emitted by a 14.0-g sample of cesium-137 in three minutes.
B.) False. It’s important to life with your legs not your back.