6. What will happen to the gravitational force between stars as the universe continues to expand?
1 answer:
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The concentration of hydroxide ion is 5 10^
−
14 M.
<u>Explanation:</u>
Consider the equilibrium of this acid's dissociation,
H C l O 4 ⇌ H + + C l O 4 -
Moreover, let's assume that H C l O 4 is a strong acid and will fully dissociate.
Hence,
[ H + ] = 0.20 M
Now, recall,
K
w = [
H
+
]
[
O
H
−
] = 1.0 10
^−
14
Hence,
⇒
[
O
H
−
] = K
w / [
H
+
] = 5 10^
−
14 M.
Answer:
97.1%
Explanation:
Using the ideal gas equation, the number of moles of hydrogen gas produced can be calculated from information provided about the volume of gas evolved at a given temperature and pressure.
The stoichiometry of the reaction is now used to obtain the number of moles of Zn that will produce a given number of moles of hydrogen from the balanced reaction equation as shown. This gives us the number of moles of zinc reacted hence the mass of zinc in the coin since it is assumed that all the zinc reacts.
This is now used to calculate the mass percentage of Zn as shown.
