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grin007 [14]
2 years ago
9

A 1.34 mole sample of LiCl dissolves in water, The volume of the final

Chemistry
1 answer:
Mamont248 [21]2 years ago
0 0

Answer:

1.56 \,\,mol/L

Explanation:

Molarity of the solution measures number of moles of a solute per litre of solution.

Molarity = volume of solution in litres/number of moles of solute dissolved in solution

Volume of solution in litres = 0.86 L

Also, 1.34 mole sample of LiCl dissolves in water

So,

Molarity of the Solution = \frac{1.34}{0.86}=1.56 \,\,mol/L

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Calculate the change in entropy that occurs in the system when 4.20 mole of diethyl ether (\(\rm C_4H_6O\)) condenses from a gas
anyanavicka [17]

Answer : The entropy change of the system is, 361.83 J/K

Solution :

Formula used :

\Delta S=\frac{n\times \Delta H_{vap}}{T_b}

where,

\Delta S = entropy change of the system = ?

\Delta H = enthalpy of vaporization = 34.6 kJ/mole

n = number of moles of diethyl ether = 4.20 mole

T_b = normal boiling point = 26.5^oC=273+26.5=307.6K

Now put all the given values in the above formula, we get the entropy change of the system.

\Delta S=\frac{4.20mole\times (34.6KJ/mole)}{307.6K}=0.36183kJ/K=0.36183\times 1000=361.83J/K

Therefore, the entropy change of the system is, 361.83 J/K

4 0
1 year ago
Which statement accurately describes the reactants of a reaction?
krek1111 [17]

Answer:

C. substances that are used up in a reaction

Explanation:

Substances are combined in a chemical reaction to give rise to other substances. The substances that come together are called REACTANTS while the substances that are produced are called PRODUCTS.

Reactants are used up in the reaction to give rise to new products at the end of the reaction. For example, in the reaction as follows:

6CO2 + 6H2O --> C6H12O6 + 6O2

CO2 (carbon dioxide) and water (H2O) are the REACTANTS of the reaction, which are used up to form glucose and oxygen (products)

6 0
1 year ago
Read 2 more answers
Avogadro’s law states that the volume (V) and number of moles (n) are directly proportional if the pressure and temperature both
natima [27]

Answer: \frac{V_1}{V_2}=\frac{n_1}{n_2}

Explanation:

According to the Avogadro's law, the volume of gas is directly proportional to the number of moles of gas at same pressure and temperature. That means,

V\propto n

or,

\frac{V_1}{V_2}=\frac{n_1}{n_2}

where,

V_1 = initial volume of gas

V_2 = final volume of gas

n_1 = initial moles of gas

n_2 = final moles of gas

3 0
2 years ago
What is the total pressure in a container with 256 mm Hg of Oz, 198 mm Hg of He,
irina1246 [14]

Answer:

P(total pressure) = 504 mmHg = 504mm/760mm/atm = 0.663 atm

Explanation:

Apply Dalton's Law of Partial Pressures.

P(total) = ∑Partial Pressures = ∑(256mm + 198mm + 48mm) = 504 mmHg

P(total pressure) = 504 mmHg = 504mm/760mm/atm = 0.663 atm

7 0
1 year ago
Which of these elements has four valence electrons
dimulka [17.4K]
<span>Any elements in Group 14, also known as the carbon group, will have four valence electrons. This group contains carbon, silicon, geranium, tin, lead, and flerovium. These elements are all in the same group precisely because of the same number of valence electrons. These electrons determine the chemical properties of an element, so all of these elements will have similar chemical properties.</span><span />
3 0
2 years ago
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