Answer:
1.054 x 10²⁴ molecules
Explanation:
In order to convert moles <em>of any given substance</em> into a number of molecules, we need to use <em>Avogadro's number</em>, which states the number of molecules -or atoms, in the case of elements- present in one mol:
- In one mol there are 6.023x10²³ molecules.
We now <u>convert 1.75 moles into molecules</u>:
- 1.75 mol * 6.023x10²³ molecules/mol = 1.05x10²⁴ molecules
Answer:
Depending on the
value of
, the cell potential would be:
, using data from this particular question; or- approximately
, using data from the CRC handbooks.
Explanation:
In this galvanic cell, the following two reactions are going on:
- The conversion between
and
ions,
, and - The conversion between
and
ions,
.
Note that the standard reduction potential of
ions to
is higher than that of
ions to
. Alternatively, consider the fact that in the metal activity series, copper is more reactive than silver. Either way, the reaction is this cell will be spontaneous (and will generate a positive EMF) only if
ions are reduced while
is oxidized.
Therefore:
- The reduction reaction at the cathode will be:
. The standard cell potential of this reaction (according to this question) is
. According to the 2012 CRC handbook, that value will be approximately
.
- The oxidation at the anode will be:
. According to this question, this reaction in the opposite direction (
) has an electrode potential of
. When that reaction is inverted, the electrode potential will also be inverted. Therefore,
.
The cell potential is the sum of the electrode potentials at the cathode and at the anode:
.
Using data from the 1985 and 2012 CRC Handbook:
.
5
mL acetic acid
95
mL water
Explanation:
Since
5
%
of the vinegar, by volume, is acetic acid, and we have
100
mL of vinegar, we have
5
mL of vinegar.
Similarly, we have
100
%
−
5
%
=
95
%
being water, so we have
95
mL of water.
Answer:
volume of brick= length × breadth × height
=0.000018 ×6.5×17.3
=
Answer:
C the number and placement of the electrons
Explanation:
Elements react with one another because they want to achieve a full valence shell of electrons. The noble gases already have a full valence shell of electrons, so they are unlikely to react with other elements.