CHEMISTRY COLLEGE

If 73.5 mL of 0.200 M KI(aq) was required to precipitate all of the lead(II) ion from an aqueous solution of lead(II) nitrate, how many moles of Pb2+ were originally in the solution?

Answers

Answer 1

Answer:

Answer:

There were 0.00735 moles Pb^2+ in the solution

Explanation:

Step 1: Data given

Volume of the KI solution = 73.5 mL = 0.0735 L

Molarity of the KI solution = 0.200 M

Step 2: The balanced equation

2KI + Pb2+ → PbI2 + 2K+

Step 3: Calculate moles KI

moles = Molarity * volume

moles KI = 0.200M * 0.0735L = 0.0147 moles KI

Ste p 4: Calculate moles Pb^2+

For 2 moles KI we need 1 mol Pb^2+ to produce 1 mol PbI2 and 2 moles K+

For 0.0147 moles KI we need 0.0147 / 2 = 0.00735 moles Pb^2+

There were 0.00735 moles Pb^2+ in the solution

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.......state Hess law

Answers

Hess's Law of Constant Heat Summation (or just Hess's Law) states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes. This law is a manifestation that enthalpy is a state function.

G write the symbols for the cation and anion that make up each ionic compound Co(NO3)2

Answers

Answer:

$Co(NO_3)_2$ is formed of cation, $Co^(2+)$ and anion, $NO_3^(-)$

Explanation:

Naming of the ionic compounds:-

The name of the cation is written first and the the name of the anion is written after the name of the cation separated by single space.
The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
In case of transition metals, the oxidation state are written in roman numerals in bracket in front of positive ions.

Hence, given ionic compound:-

$Co(NO_3)_2$ is formed of cation, $Co^(2+)$ and anion, $NO_3^(-)$

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16. Which of the following properties of the elements remain unchanged across#period
A lonivation energy
C Electro negativity
13. Number of shells
D. Nuclear charge

Answers

Answer:

Number of shells

Explanation:

Across the period on the periodic table, the number of shells remains the same. There is no variation or trend for the number of shells on a period.

The number of shell is the energy level corresponding to an atom.
As we go from period to period, the energy level increases by 1.
The period number corresponds to the number of shells.
Elements in period 4 will have 4 shells.
There is no variation of any sort in the number of shell across a period.

What type(s) of intermolecular forces exist between two molecules of 1-pentanol? (BLB Ch. 11)

Answers

Answer:

Hydrogen bonding

London dispersion forces

Explanation:

The most pronounced and consequential intermolecular forces at play has to be hydrogen bonding due to the dipole created between the oxygen and hydrogen in the hydroxyl group. And then to a lesser extent there are very weak London dispersion forces that are always going to be there in between any two molecules of any species.

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