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GrogVix [38]
3 years ago
10

How many moles of aluminum oxide are produced according to the reaction below given that you start with 10.0 g of Al and 19.0 gr

ams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A) 0.396 B) 0.185 C) 0.741 D) 5.00 E) not enough information
Chemistry
1 answer:
Rasek [7]3 years ago
3 0

Answer:

The answer to your question is:   x = 0.185 mol of Al2O3

Explanation:

Data

10 g of Al and 19 grams of O2

Reaction:                                4Al       +       3O2       →       2Al2O3

                                            4(27)                3(32)               2 ( 102)

                                             108g                 96g                    204g

Limiting reactant

                                    108g  Al ------------------  96g  O2

                                      10 g      -----------------     x

                                     x = (10 x 96) / 108 = 8.9 g of O2

Then limiting reactant is Al

So

                                  108 g of Al ----------------------   204 g of Al2O3

                                    10 g         ----------------------     x

                                   x = (10 x 204) / 108 = 18.8 g of Al2O3

                                    102 g of Al2O3 ----------------- 1 mol

                                      18.8                 -----------------   x

                                  x = 0.185 mol of Al2O3

                         

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3 years ago
Dinitrogen tetraoxide, N2O4, decomposes to nitrogen dioxide, NO2, in a first-order process. If k = 1.5 x 103 s-1 at 5 ºC and k =
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Answer:

The activation energy for the decomposition = 33813.28 J/mol

Explanation:

Using the expression,

\ln \dfrac{k_{1}}{k_{2}} =-\dfrac{E_{a}}{R} \left (\dfrac{1}{T_1}-\dfrac{1}{T_2} \right )

Wherem  

k_1\ is\ the\ rate\ constant\ at\ T_1

k_2\ is\ the\ rate\ constant\ at\ T_2

E_a is the activation energy

R is Gas constant having value = 8.314 J / K mol  

Thus, given that, E_a = ?

k_2=4.0\times 10^3s^{-1}

k_1=1.5\times 10^3s^{-1}  

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T_2=25\ ^0C  

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

So,  

T = (5 + 273.15) K = 278.15 K  

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So,

\ln \frac{1.5\times 10^3}{4.0\times 10^3}\:=-\frac{E_{a}}{8.314}\times \left(\frac{1}{278.15}-\frac{1}{298.15}\right)

E_a=-\ln \frac{1.5\times \:10^3}{4.0\times \:10^3}\:\times \frac{8.314}{\left(\frac{1}{278.15}-\frac{1}{298.15}\right)}

E_a=-\frac{8.314\ln \left(\frac{1.5\times \:10^3}{4\times \:10^3}\right)}{\frac{1}{278.15}-\frac{1}{298.15}}

E_a=-\frac{689483.53266 \ln \left(\frac{1.5}{4}\right)}{20}

E_a=33813.28\ J/mol

<u>The activation energy for the decomposition = 33813.28 J/mol</u>

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