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grandymaker [24]
3 years ago
9

*

Chemistry
1 answer:
svp [43]3 years ago
4 0

Answer:

molecules in a substance move around relative to each other

Explanation:

It means that molecules of a substance are mobile or locomotive or localised.

such as gases

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PRACTICE PROBLEM 3
Leni [432]

Answer:

Explanation:

?

3 0
3 years ago
The molar volume of a certain solid is 142.0 cm3 mol−1 at 1.00 atm and 427.15 k, its melting temperature. the molar volume of th
kotykmax [81]

Answer:

\Delta _{fus}H=3255.3J/mol

\Delta _{fus}S=7.62\frac{J}{mol*K}

Explanation:

Hello,

Clausius Clapeyron equation is suitable in this case, since it allows us to relate the P,T,V behavior along the described melting process and the associated energy change. Such equation is:

\frac{dp}{dT}=\frac{\Delta _{fus}H}{T\Delta _{fus}V}

As both the enthalpy and volume do not change with neither the temperature nor the pressure for melting processes, its integration turns out:

p_2-p_1=\frac{\Delta _{fus}H}{\Delta _{fus}V}ln(\frac{T_2}{T_1} )

Solving for the enthalpy of fusion we obtain:

\Delta _{fus}H=\frac{(p_2-p_1)(V_2-V1)}{ln(\frac{T_2}{T_1})} =\frac{(11.84atm-1.00 atm)(156.6cm^3/mol-142.0cm^3/mol)}{ln(\frac{429.26K}{427.15K} )} \\\\\Delta _{fus}H=32127.3atm*cm^3/mol*\frac{101325Pa}{1atm}*(\frac{1m}{100cm} )^3\\\Delta _{fus}H=3255.3J/mol

Finally the entropy of fusion is given by:

\Delta _{fus}S=\frac{\Delta _{fus}H}{T_1} =\frac{3255.3J/mol}{427.15K}\\ \\\Delta _{fus}S=7.62\frac{J}{mol*K}

Best regards.

5 0
3 years ago
Why is foam fight chemical or a physical change
nata0808 [166]

Answer:

Foam fight is a chemical change.

Explanation:

Please give me brainliest :)

4 0
3 years ago
Read 2 more answers
4. You have a 1 M solution of KCl. You need to generate 100 mL of 0.25 M KCl. Explain how you would make this
andrew-mc [135]

1M KCl will require 25 mL to generate 100 mL of 0.25M KCl.

Molarity of a solution is defined as number of moles of solute present in 1000 mL of the solution.

M=\frac{n}{V}\times1000

So molarity is inversely proportional to the volume of the solution.

As solution is diluted. Molarity of the solution decreases.

1M of KCl means 1 mole of KCl in 1000 mL of the solution.

1M KCl is four times as concentrated as 0.25M KCl.

Therefore, to make 100 mL of 0.25M will require \frac{100}{4}= 25 mL of 1M KCl diluted to 100 mL of distilled water.

Easy alternative: Dilution formula

M_1\times V_1 = M_2\times V_2

Where M_1 \,and\, V_1 are volume and concentration of first solution

and M_2\,and\, V_2 are of second solution.

1\times V= 0.25\times100\\\\V= 25\,mL

Learn more about dilution formula here,

brainly.com/question/18917740

#SPJ4

5 0
2 years ago
A 5-kg quantity of radioactive isotope decays to 2 kg after 10 years. Find the decay constant of the isotope.k = _____
Dvinal [7]

Answer:

k = -0.09165 years^(-1)

Explanation:

The exponential decay model of a radioactive isotope is generally given as;

A(t) = A_o(e^(kt))

Where;

A_o is quantity of isotope before decay, k is decay constant and A(t) is quantity after t years

We are given;

A_o = 5 kg

A(10) = 2kg

t = 10 years

Thus;

A(10) = 2 = 5(e^(10k))

Thus;

2 = 5(e^(10k))

2/5 = (e^(10k))

0.4 = (e^(10k))

In 0.4 = 10k

-0.9164 = 10k

k = -0.9164/10

k = -0.09165 years^(-1)

7 0
3 years ago
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