Chemistry, 28.10.2020 16:30 alexisbcatlett14

How many isomers can be drawn (constitutional and stereoisomers) for dimethylcyclopropane in which the cyclopropane remains intact

Answers: 3

Show answers

Answers

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

Answer from: Quest

The answer would be true

Answer from: Quest

Steel shot weighs about two-thirds as much.hoped i can i get brainliest

Answer from: Quest

option c: 1605.1 kj

the balanced chemical reaction for combustion of methane is as follows:

$ch_{4}+2o_{2}\rightarrow co_{2}+2h_{2}o$

here, enthalpy formation of $ch_{4}, o_{2}, co_{2} and h_{2}o$ is -74.7 kj/mol, 0 kj/mol, -393.5 kj/mol and -241.82 kj/mol respectively.

the heat released or $\delta h_{reaction}$ can be calculated as follow:

$\delta h_{reaction}=\delta h_{f}_{co_{2}}+2(\delta h_{f}_{h_{2}o} h_{f}_{ch_{4}}-2\delta h_{f}_{o_{2}})$

putting the values,

$\delta h_{reaction}=-393.5 kj/mol+(.82 kj/.6-(2)(0 kj/mol))=802.54 kj/mol$

thus, heat released by combustion of 1 mol of methane is 802.54 kj/mol. thus, for 2 mol, heat released will be:

$\delta h_{reaction}=(2 mol)(802.54 kj/mol)=1605.1 kj$

therefore, heat released by the combustion of 2 mol of methane is 1605.1 kj.

Another question on Chemistry

Chemistry, 22.06.2019 02:30

What is the relation between concentration of reactants and the rate of chemical reaction?

Answers: 1

Answer

Chemistry, 22.06.2019 05:50

According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?

Answers: 1

Answer

Chemistry, 22.06.2019 14:00

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.

Answers: 3

Answer

Chemistry, 22.06.2019 20:00

What is the molarity of the solution produced when 145 g of nacl is dissolved in sufficient water to prepare 2.75 l of solution?

Answers: 1

Answer

You know the right answer?

How many isomers can be drawn (constitutional and stereoisomers) for dimethylcyclopropane in which t...

Questions