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3 years ago

Draw the structural formula for 1 bromo 3 phenyl 5 heptyne

Chemistry

1 answer:

MrRissso [65]3 years ago

6 0

See Figure 4 below.

1. Draw a 7-carbon chain and number the carbon atoms (Figure 1).

2. Insert a triple bond between atoms 5 and 6 (Figure 2).

3. Attach a phenyl group to atom 3 (Figure 3).

4. Attach a Br to atom 1 (Figure 4).

And you have your structure.

Note: The C≡C triple bond takes priority in the naming, so we must number the chain from the other end. The correct name is

7-bromo-5-phenylhept-2-yne (all one word).

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How do you represent a shared pair of electrons when drawing the Lewis structure of a covalent bond

nataly862011 [7]

Answer: Each pair of shared electrons is a covalent bond which can be represented by a dash.

Explanation:

In a Lewis dot structure, the central atom can share electrons through bonds with the surrounding atoms, and this can look like a dash between the atoms.

6 0

3 years ago

At a certain temperature and pressure, one liter of CO2 gas weighs 1.95 g.

AysviL [449]

Answer:

1.332 g.

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

At the same T and P and constant V (1.0 L), different gases have the same no. of moles (n):

∴ (n) of CO₂ = (n) of C₂H₆

∵ n = mass/molar mass

∴ (mass/molar mass) of CO₂ = (mass/molar mass) of C₂H₆

mass of CO₂ = 1.95 g, molar mass of CO₂ = 44.01 g/mol.

mass of C₂H₆ = ??? g, molar mass of C₂H₆ = 30.07 g/mol.

∴ mass of C₂H₆ = [(mass/molar mass) of CO₂]*(molar mass) of C₂H₆ = [(1.95 g / 44.01 g/mol)] * (30.07 g/mol) = 1.332 g.

7 0

3 years ago

What is the molecular formula of a hydrocarbon with m+ = 78?

fiasKO [112]

A molecular formula represents the exact number of atoms present for each element in the compound.

For carbon atom: $\frac{78}{12}$ = $6\frac{6}{12}$ ( as molar mass of carbon is 12 g/mol)

Now, 6 carbon atoms are present and rest are hydrogen atoms i.e. 6

Thus, formula becomes $C_{6}H_{6}$ ( $C_{x}H_{y})$

Now, check for unsaturation:

Degree of unsaturation = $\frac{2x+2-y}{2}$

Substitute the value of x and y,

Degree of unsaturation = $\frac{2(6)+2-6}{2}$

= $\frac{12-4}{2}$

= $4$ implies one ring and three double bonds.

Thus, formula comes out to be $C_{6}H_{6}$ i.e. benzene ring.

4 0

4 years ago

Calculate the enthalpy for the following reaction. During the reaction, the temperature changes from 42.5 C to 37 C. The specifi

Dahasolnce [82]

Answer:

$q = 0.810$ Kj/mol

Its an endothermic reaction

Explanation:

Enthalpy can be evaluated by using following formula -

$q = m * c* \delta T$

where

q is the enthalpy or change in internal energy

m is the mass in kg

c is the specific heat

and $\delta T$ is the change in temperature

Mass of HCl is equal to $36.46$ g/mol

Mass of HCl is equal to $0.03646$ Kg/mol

Substituting the given values in above equation, we get-

$q = 0.03646 * 4.04 * (42.5 - 37)\\q = 0.03646 * 4.04 * 5.5 \\$

$q = 0.810$ Kj/mol

Enthalpy is positive thus it is an endothermic reaction

4 0

3 years ago

Balance this reaction: (_)NH3 + (_)H2SO4 = (_) (NH4)2SO4 1.2.2 2,1,1 2.2.1

natka813 [3]

Answer: 2,1,1

Explanation:

6 0

3 years ago