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dybincka [34]
1 year ago
7

Carbon tetrachloride contains one carbon and four chlorine atoms. for this compound 11.818 g of chlorine combine with 1.000 g of

c-12. using this information, calculate the atomic mass of chlorine.
Chemistry
2 answers:
Feliz [49]1 year ago
5 0
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Step2247 [10]1 year ago
3 0

Answer:

Atomic mass of Cl = 35.46 g/mol

Explanation:

From the given information:

Carbon tetrachloride CCl_{4} contains one carbon (C) and for chlorine (Cl) atoms

11.818 g of Cl combines with 1.000 g of C-12

Moles of C :

= \frac{Mass\ C}{Atomic\ Mass} =\frac{1.000g}{12g/mol} =0.0833moles

Molar ratio of C:Cl = 1:4

Therefore, moles of Cl is:

4(0.0833) = 0.3332moles

Atomic mass of Cl is:

\frac{Mass\ Cl}{moles\ Cl} =\frac{11.818g}{0.3332moles} =35.46 g/mol

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Answer:

12.78 kJ

Explanation:

The correct balanced reaction would be

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Moles of methanol can be obtained by dividing the mass of methanol with its molar mass (32.04\ \text{g/mol})

\dfrac{3.24}{32.04}=0.10112\ \text{moles}

Enthalpy change for the number of moles is given by

\dfrac{\text{Number of moles of methanol in the reaction}}{\text{Enthalpy change in the reaction}}=\dfrac{\text{Number of moles in 3.24 g of methanol}}{\text{Enthaply in change in the mass of methanol}}

\\\Rightarrow\dfrac{2}{252.8}=\dfrac{0.10112}{\Delta H}\\\Rightarrow \Delta H=\dfrac{0.10112\times 252.8}{2}\\\Rightarrow \Delta H=12.781568\approx 12.78\ \text{kJ}

The change in enthalpy is 12.78 kJ.

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2 years ago
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OlgaM077 [116]

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7 0
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A metal oxide with the formula mo contains 15.44% oxygen. in the box below, type the symbol for the element represented by m.
lana66690 [7]

<u>Answer:</u> The element represented by M is Strontium.

<u>Explanation:</u>

Let us consider the molar mass of metal be 'x'.

The molar mass of MO will be = Molar mass of oxygen + Molar mass of metal = (16 + x)g/mol

It is given in the question that 15.44% of oxygen is present in metal oxide. So, the equation becomes:

\frac{15.44}{100}\times (x+16)=16g/mol\\\\(x+16)=\frac{16g/mol\times 100}{15.44}\\\\x=(103.626-16)g/mol\\\\x=87.62g/mol

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1 year ago
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DNA can be replicated through an in vivo mechanism or a polymerase chain reaction (PCR) mechanism. Match each description to the
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Complete question from other source attached

Answer:

Explanation:

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2 years ago
Exactly 1.0 mol N2O4 is placed in an empty 1.0-L container and allowed to reach equilibrium described by the equation N2O4(g) 2N
Amanda [17]

Answer : The correct option is, (a) 0.44

Explanation :

First we have to calculate the concentration of N_2O_4.

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\text{Concentration of }N_2O_4=\frac{1.0moles}{1.0L}=1.0M

Now we have to calculate the dissociated concentration of N_2O_4.

The balanced equilibrium reaction is,

                             N_2O_4(g)\rightleftharpoons 2NO_2(aq)

Initial conc.           1.0 M          0

At eqm. conc.     (1.0-x) M    (2x) M

As we are given,

The percent of dissociation of N_2O_4 = \alpha = 28.0 %

So, the dissociate concentration of N_2O_4 = C\alpha=1.0M\times \frac{28.0}{100}=0.28M

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Now we have to calculate the equilibrium constant for the reaction.

The expression of equilibrium constant for the reaction will be:

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Now put all the values in this expression, we get :

K_c=\frac{(0.56)^2}{0.72}=0.44

Therefore, the equilibrium constant K_c for the reaction is, 0.44

8 0
2 years ago
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