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3 years ago

How many of the carbon–carbon bonds in the compound have staggered conformers that are all equally stable?

Chemistry

2 answers:

Anon25 [30]3 years ago

8 0

Answer : The 3 carbons which are bonded to $CH_{3}$ have equally stable staaggered conformers.

There are 3 identical atoms of hydrogens in 2-methylhexane molecule (refer attached figure)

Therefore any degree of rotation of 60 or 180 or 300 in C-C bond will give a stable conformer of the same energy.

The image is attached for the stable staggered conformation.

lyudmila [28]3 years ago

3 0

In stereoisomers, there are two classifications: staggered and eclipsed conformations. The staggered conformation is when the bonds are not symmetric. Eclipsed is less stable than the staggered conformation. It actually depends on the compound. For example, the ethane is drawn in the staggered conformation, which only has 1 C-C single bond.

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Small quantites of hydrogen gas can be prepared in the laboratory by the addition of aqueous hydrochloric acid to metallic zinc.

ira [324]

Answer: The mass or zinc reacted is 0.624 grams.

Explanation:

We are given:

Total pressure = 1.032 atm

Vapor pressure of water = 32 torr = 0.042 atm (Conversion factor: 1 atm = 760 torr)

To calculate partial pressure of hydrogen gas, we use the equation:

$p_{H_2}=p_T-p_{H_2O}\\\\p_{H_2}=1.032-0.042=0.99atm$

To calculate the number of moles of hydrogen gas, we use the equation given by ideal gas follows:

$PV=nRT$

where,

P = pressure of hydrogen gas = 0.99 atm

V = Volume of hydrogen gas = 240. mL = 0.240 L (Conversion factor: 1 L = 1000 mL)

T = Temperature of hydrogen gas = $30^oC=[30+273]K=303K$

R = Gas constant = $0.0821\text{ L. atm }mol^{-1}K^{-1}$

n = number of moles of hydrogen gas = ?

Putting values in above equation, we get:

$0.99atm\times 0.240L=n\times 0.0821\text{ L atm }mol^{-1}K^{-1}\times 303K\\n=\frac{0.99\times 0.240}{0.0821\times 303}=9.55\times 10^{-3}mol$

The chemical equation for the reaction of zinc and hydrochloric acid follows:

$Zn+2HCl\rightarrow ZnCl_2+H_2$

By Stoichiometry of the reaction:

1 mole of hydrogen gas is produced from 1 mole of zinc metal

So, $9.55\times 10^{-3}mol$ of hydrogen gas is produced from = $\frac{1}{1}\times 9.55\times 10^{-3}=9.55\times 10^{-3}mol$ of zinc metal

To calculate the mass of zinc metal, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Molar mass of zinc = 65.38 g/mol

Moles of zinc = $9.55\times 10^{-3}$ moles

Putting values in above equation, we get:

$9.55\times 10^{-3}mol=\frac{\text{Mass of zinc}}{65.38g/mol}\\\\\text{Mass of zinc}=(9.55\times 10^{-3}mol\times 65.38g/mol)=0.624g$

Hence, the mass or zinc reacted is 0.624 grams.

4 0

3 years ago

Glycerine is viscous than water?why

Sloan [31]

Answer:

Yes

Explanation:

Why is glycerol more viscous than water?

The glycerine is more viscous than water because due to presence of hydrogen atoms , we all know that glycerine has more hydrogen bonding than water molecule , which makes an aggregation which means that glycerine is more viscous than water , in simple words glycerine can't flow as that of water molecule.

7 0

3 years ago

Which statement describes what happens when somebody slaps their hand on a wall?

laiz [17]

Answer:

B. Wall applies equal reaction force on hand

Explanation:

This is newton's third law. You push something, that something pushes you back with same force. The direction is opposite, so if I push a wall, the wall pushes me back with same force just in opposite direction (so wall towards me). This is why option A is incorrect b/c it says force in same direction as wall. C and D talk about unequal force which is incorrect.

7 0

2 years ago

Name two metalloids that are semiconductors

guajiro [1.7K]

The Metalloids are:

Boron.

Silicon.

5 0

3 years ago

3. Which is not true about natural selection?

tatuchka [14]

Answer:

A:There must be diversity in the population.

Explanation:

Hopefully this helps!

5 0

3 years ago