3.

At 1000°C, cyclobutane (C4H8) decomposes in a first-order reaction, with the very high rate constant of 68 1/s, to two molecules

Kazeer [188]

Answer:

$t=0.0114 s$

Explanation:

For first order reaction we are going to use the following formula:

$t=\frac{2.73}{k} \log\frac{x}{x-a}$

where:

k is the constant

x is the initial concentration

a is the final concentration

x-a is the amount left

IN our Case:

k=68 (1/s), x=1.84. Calculating x-a:

% of cyclobutane left after time t=100-52=48%

Final Concentration=1.84*48%=0.8832

x-a=Initial concentration - Final Concentration

x-a=1.84-0.8832

x-a=0.9568

Now:

$t=\frac{2.73}{68} \log\frac{1.84}{0.9568}$

$t=0.0114 s$

In order,for cyclobutane to decompose to 52%, time taken is 0.0114 sec.

8 0

3 years ago

Periodic trends are shaped by interactions between what?

11111nata11111 [884]

Answer:

There are three factors that help in the prediction of the trends in the periodic table: number of protons in the nucleus, number of energy levels, and the shielding effect. The atomic radii increase from top to the bottom in any group. The atomic radii decrease from left to right across a period.

Explanation:

Major periodic trends include atomic radius, ionization energy, electron affinity, electronegativity, valency and metallic character. These trends exist because of the similar electronic configuration of the elements within their respective groups or periods and because of the periodic nature of the elements.

8 0

1 year ago

Which equation represents a spontaneous transmutation?ca(s) + 2h2o(ℓ) → ca(oh)2(aq) + h2(g)2kclo3(s) → 2kcl(s) + 3o2(g)?

stepladder [879]

Correct Answer: C<span>a(s) + 2H2O(ℓ) → Ca(OH)2(aq) + H2(g)

Reason:
A reaction (</span>transmutation) is said to be spontaneous if it occurs on it's own, without any external stimulus. For spontaneous reaction, change in free energy (ΔG) is negative.

Among the given reactions, Ca(s) + 2H2O(ℓ) → Ca(OH)2(aq) + H2(g) occurs on its own with supplying external energy. Hence, it is a spontaneous reaction. Further, it is an exothermic reaction. So during the reaction heat is given out by the system.

On other hand, reaction: <span>2KClO3(s) → 2KCl(s) + 3O2(g) is a decompostion reaction. For occurrence of reaction, heat has to be supplied to system. Hence, this reaction is non-spontaneous in nature. </span>

5 0

3 years ago

What is the molecule shown below?

arsen [322]

Answer:

2,3 -Dimethyl pentane

Explanation:

The given molecule is 2,3-Dimethyl pentane.

First of all select the longest chain of C-C atom. This will be the parent name.

In given structure the longest chain is straight chain that contain five carbon. Thus the parent name will pentane and there is no double or triple bond the given structure is of alkane.

Than locate the positions of functional groups attached.

In given structure there are two methyl groups are present. Give the name in such a way that functional groups will have lowest number. In given case we will start from the left.

The first methyl group will have number 2 and second will have number 3.

The name will be,

2,3-Dimethyl pentane

8 0

3 years ago

When dinitrogen pentaoxide, a white solid, is heated, it decomposes to produce nitrogen dioxide gas and

AysviL [449]

9.5314 L is the volume of nitrogen dioxide formed at 103.25 kPa and 22.75 °C.

<h3>What is an ideal gas equation?</h3>

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Given data:

Oxygen produced - 1.618 gram

Decomposition of $N_2O_5$ takes place.